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#1
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to *almost* the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. |
#2
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
It seems that the cardboard would have to be wet in order to be conductive
enough to cause a problem but it would be very easy to run a simple test just using a meter to measure current flow. "Thomas G. Marshall" . com wrote in message news:PAsGh.235$1C6.156@trndny04... I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to *almost* the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. |
#3
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Thomas G. Marshall" . com wrote in message news:PAsGh.235$1C6.156@trndny04... Is there another possibility for this, other than just lesser quality batteries? No, they're just crap. And is the cardboard shorting even possible? No. I buy 'brand name' dollar store batteries and they're fine. The dollar store button cells may be another story. |
#4
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
On Sun, 04 Mar 2007 05:14:23 GMT, "Thomas G. Marshall"
. com wrote: I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to *almost* the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? Most likely 'fake' Energizer batteries. Common problem, take a very cheap import battery, put a new lable on it, and sell it for *more* than it is worth! As to moist cardboard draining them, IMHO unlikely unless the cardboard or moisture has some contamination (salt?) that increases conductivity. Easy enough to test, just put some (say two or three) batteries in series and connect to cardboard while measuring the current. Bet it reads zero. I think you got scammed with sub-standard (or very outdated) batteries. And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. |
#5
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
PeterD said something like:
....[rip]... Most likely 'fake' Energizer batteries. Common problem, take a very cheap import battery, put a new lable on it, and sell it for *more* than it is worth! I've heard of such things....is there a way to distinguish batteries I wonder? As to moist cardboard draining them, IMHO unlikely unless the cardboard or moisture has some contamination (salt?) that increases conductivity. Yep, but I am also wondering about the acidity. I know from my comic book collection years that all paper products, and in *particular* brown corregated cardboards, are far below PH-7. I don't know if there is a salt that is in it, or something else very mildly conductive. I'm getting more convinced from you guys however that I'm barking up the wrong tree here... Easy enough to test, just put some (say two or three) batteries in series and connect to cardboard while measuring the current. Bet it reads zero. With my multimeter, a miniscule current flow would be within the noise. I think you got scammed with sub-standard (or very outdated) batteries. Understood. It's also possible that the seller doesn't know /his/ supplier well enough, though I'm certainly not making assumptions in any direction right now. I did notice that a couple of the batteries didn't have dates on them at all. And some of those had "made in singapore" stamped on their sides. Is it possible for energizer to be manufactured there on occassion? The seller to me buys the energizer-AA's in bulk lots of 5000. He is interested in getting to the bottom of this---is there a way for him to know what's what? I have moved beyond caring about this particular order and am interested in figuring out /how/ to safely buy batteries cheaply. For example, the children's toys eat up AA's like candy, and we have a baby swing chair that uses more C batteries than a woman's prison... -- "So I just, uh... I just cut them up like regular chickens?" "Sure, just cut them up like regular chickens." |
#6
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
I recently ordered on eBay 100 energizer AA batteries.
I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to almost the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. |
#7
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Thomas G. Marshall" . com wrote in message news:X2BGh.552$mI6.114@trndny08... I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to almost the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. Most likely you bought old batteries. |
#8
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
So I ran a little test.
Somewhat humid cardboard (sitting in my unheated garage in Seattle in the middle of winter) measures over 100 megohms on my multimeter. Sopping wet cardboard (tapwater) measures 1 megohm. Test points 3" apart although it didn't seem to matter much. Energizer rated at 2850 mah Leakage into wet cardboard would be 1.5/1000= .0015 ma. Time to discharge battery would be 2850/.0015=1.9 million hours or somewhat over 200 years. I suppose the water could have contained more ions than my tap water but knowing that the human body is quite conductive I also checked the resistance across my tongue and found it to be 1/10 that of the cardboard so it would still take over 20 years to discharge the battery. I guess I would look elsewhere for the dead battery gremlin. "Thomas G. Marshall" . com wrote in message news:PAsGh.235$1C6.156@trndny04... I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to *almost* the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. |
#9
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Tom Biasi" wrote in message
... "Thomas G. Marshall" . com wrote in message news:X2BGh.552$mI6.114@trndny08... I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a snipped Most likely you bought old batteries. Though you don't have to buy the most expensive to get a decent product, you do have to watch what you buy. I've bought some "cheap" batteries in my past and well - not only did they go dead fast, they leaked and caused some damage to the item. A bargain - it was not. The damage was realitively easy to correct - but I knew then not to buy "some" off brands. Sounds like you guys got a bum shipment of batteries. I tend to agree with the other guys, it is highly doubtful the "shipping" box caused them to go dead. It would have to have been made damp and have good contact - top and bottom of cells. |
#10
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
On Sun, 04 Mar 2007 14:52:39 GMT, "Thomas G. Marshall"
. com wrote: I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to almost the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. Report the seller to ebay's fraud department and have the idiot banned from ebay. If more people would report these scammers it might make it a better shopping experience. http://pages.ebay.com/securitycenter/?ssPageName=f:f:US |
#11
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"maxfoo" wrote in message ... On Sun, 04 Mar 2007 14:52:39 GMT, "Thomas G. Marshall" . com wrote: Report the seller to ebay's fraud department and have the idiot banned from ebay. If more people would report these scammers it might make it a better shopping experience. http://pages.ebay.com/securitycenter/?ssPageName=f:f:US Pretty extreme retribution toward someone whose product was 96% satisfactory and who was working with the buyer to resolve the problem. Perhaps you could share your Ebay id with the group so we could avoid doing business with you. |
#12
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Jack" wrote in message
news:mnHGh.3978$Tf.2138@trndny03... "maxfoo" wrote in message ... On Sun, 04 Mar 2007 14:52:39 GMT, "Thomas G. Marshall" . com wrote: Report the seller to ebay's fraud department and have the idiot banned from ebay. If more people would report these scammers it might make it a better shopping experience. http://pages.ebay.com/securitycenter/?ssPageName=f:f:US Pretty extreme retribution toward someone whose product was 96% satisfactory and who was working with the buyer to resolve the problem. Perhaps you could share your Ebay id with the group so we could avoid doing business with you. Do we "really" know the seller was working to solve the problem? OR just blowing off the buyer with a bunch of questions - he himself may have had no clue of? I'm not saying the seller wasn't trying to resolve the issue - but there is no way to prove it. It is as we've seen, a far stretch to imagine "cardboard shipping container" to short out batteries. OR some being dead as I believe was also the case. In buying bulk, you're probably always going to have some defective product show up - I've had it happen to me. Actually, maybe the seller could have offered to reimburse some money for loss - but if "he" wasn't BSing the buyer, then he had about as much knowledge and chance for a refund - as the buyer seems to have had. Us trying to prove the case for the buyer OR seller - most likely won't make a damned bit of difference to the original supplier if the seller indeed relied on one. When you factor in all the product in a "bulk" deal - you figure out your per piece cost and then see what you've lost. Is it worth dicking around trying to prove anything - or just toss in the trash and forget about it? Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. Just my 2 cents |
#13
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Thomas G. Marshall" . com wrote in message news:EQAGh.247$1C6.141@trndny04... For example, the children's toys eat up AA's like candy, and we have a baby swing chair that uses more C batteries than a woman's prison... You can buy rechargeable alkalines. They'd be good in service like this. You can also recharge regular alkalines with the charger. They say you can't but you can. |
#14
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Radiosrfun" wrote in message ... Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. I can buy an 8 pack for $1 here. They're good. The fake Energizer 12 per pack are total crap. |
#15
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Jamie" t wrote in message ... Kind of reminds me when i bought a brick of what i thought was Duracell's AA's. after the first set of cells died in a short lived period, i noticed they said Duraking and had the same copper top casing and all. Yeah, that's a sure sign of crap IME. |
#16
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humidenough?
Homer J Simpson wrote:
"Radiosrfun" wrote in message ... Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. I can buy an 8 pack for $1 here. They're good. The fake Energizer 12 per pack are total crap. Kind of reminds me when i bought a brick of what i thought was Duracell's AA's. after the first set of cells died in a short lived period, i noticed they said Duraking and had the same copper top casing and all. -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5 |
#17
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
Radiosrfun said something like:
"Jack" wrote in message news:mnHGh.3978$Tf.2138@trndny03... "maxfoo" wrote in message ... On Sun, 04 Mar 2007 14:52:39 GMT, "Thomas G. Marshall" . com wrote: Report the seller to ebay's fraud department and have the idiot banned from ebay. If more people would report these scammers it might make it a better shopping experience. http://pages.ebay.com/securitycenter/?ssPageName=f:f:US Pretty extreme retribution toward someone whose product was 96% satisfactory and who was working with the buyer to resolve the problem. Perhaps you could share your Ebay id with the group so we could avoid doing business with you. Do we "really" know the seller was working to solve the problem? OR just blowing off the buyer with a bunch of questions - he himself may have had no clue of? I'm not saying the seller wasn't trying to resolve the issue - but there is no way to prove it. It is as we've seen, a far stretch to imagine "cardboard shipping container" to short out batteries. OR some being dead as I believe was also the case. All such notions were mine from the start. The buyer isn't the one with the questions. He is just interested in what I discovered, and seems to be genuine in this, or so I think. In buying bulk, you're probably always going to have some defective product show up - I've had it happen to me. Actually, maybe the seller could have offered to reimburse some money for loss - but if "he" wasn't BSing the buyer, then he had about as much knowledge and chance for a refund - as the buyer seems to have had. Us trying to prove the case for the buyer OR seller - most likely won't make a damned bit of difference to the original supplier if the seller indeed relied on one. Your wording here is a little unclear to me, but I'll try to clear it up by saying that the seller *did* offer me a full refund. I didn't press him on this to see if it included shipping or not, but I think he would have. *Plus*, he also without me asking to put in a small package of 16 AA's (some unknown brand) for free. I really just get the sense that this is a guy attempting relying on feedback and because his feedback has been almost entirely positive he simply was unaware of any issues. When you factor in all the product in a "bulk" deal - you figure out your per piece cost and then see what you've lost. Is it worth dicking around trying to prove anything - or just toss in the trash and forget about it? Discussions are valuable when they instruct, so this seems like a worthwhile conversation. There's much here for me to learn about the consumer battery world, and I'll leave it at that. -- Everythinginlifeisrealative.Apingpongballseemssmal luntilsomeoneramsitupyournose. |
#18
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
On Sun, 04 Mar 2007 22:04:02 GMT, "Jack" wrote:
"maxfoo" wrote in message .. . On Sun, 04 Mar 2007 14:52:39 GMT, "Thomas G. Marshall" . com wrote: Report the seller to ebay's fraud department and have the idiot banned from ebay. If more people would report these scammers it might make it a better shopping experience. http://pages.ebay.com/securitycenter/?ssPageName=f:f:US Pretty extreme retribution toward someone whose product was 96% satisfactory and who was working with the buyer to resolve the problem. Perhaps you could share your Ebay id with the group so we could avoid doing business with you. You don't need to bid on the item to report fraud, hell I've had a few crooks banned before their auction was over. All in the test equipment department. |
#19
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
Jamie said something like:
Homer J Simpson wrote: "Radiosrfun" wrote in message ... Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. I can buy an 8 pack for $1 here. They're good. The fake Energizer 12 per pack are total crap. Kind of reminds me when i bought a brick of what i thought was Duracell's AA's. after the first set of cells died in a short lived period, i noticed they said Duraking and had the same copper top casing and all. Is there a reliable 3rd party battery reviewer/tester/etc. ? Perhaps consumer reports? Or does anyone else know of any? I can tell you from a fairly thorough experiment of mine involving a Sony Walkman (analog audio casset tape) in the gym for nearly 2 hours every day, that AA-energizer (classic energizer, not e2 or anything else fancy) beat duracell's standard coppertop alkaline every single time. Big thorough experiement, but very narrowly focused on 2 brands, one device, and one "way" of using it (left on with no stops and restarts). But it was without deviation: E beat D in this narrow case. But what of BJ's "Berkely & Jensen" OEM'd brand? Or any of the other million mumble names out there, probably 99% of them originating in asia. Any good ones people like? -- Everythinginlifeisrealative.Apingpongballseemssmal luntilsomeoneramsitupyournose. |
#20
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
Jack said something like:
So I ran a little test. Somewhat humid cardboard (sitting in my unheated garage in Seattle in the middle of winter) measures over 100 megohms on my multimeter. Sopping wet cardboard (tapwater) measures 1 megohm. Test points 3" apart although it didn't seem to matter much. Energizer rated at 2850 mah Leakage into wet cardboard would be 1.5/1000= .0015 ma. Time to discharge battery would be 2850/.0015=1.9 million hours or somewhat over 200 years. I suppose the water could have contained more ions than my tap water but knowing that the human body is quite conductive I also checked the resistance across my tongue and found it to be 1/10 that of the cardboard so it would still take over 20 years to discharge the battery. I guess I would look elsewhere for the dead battery gremlin. If you found that it would take 20 years to discharge a battery shorted by your tongue, I'm suspicious that there's a miscalculation or broken metric somewhere. -- Forgetthesong,I'dratherhavethefrontallobotomy... |
#21
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humidenough?
Homer J Simpson wrote: "Radiosrfun" wrote in message Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. I can buy an 8 pack for $1 here. They're good. The fake Energizer 12 per pack are total crap. 'Fake' Energisers ? Do they have 'fake' written on them ? Graham |
#22
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Eeyore" wrote in message ... 'Fake' Energisers ? Do they have 'fake' written on them ? They look the same as or similar to a good brand but they self destroy without even being used. |
#23
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
On 2007-03-04, Thomas G. Marshall . com wrote:
I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, dig out your magnefying glass, what's the use-by date on those batteries? Bye. Jasen |
#24
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
So specifically in what part of the calculation did you find an error?
Or are you perhaps remembering the jolt you get when you 'test' a nine volt battery by touching it to your tongue. "Thomas G. Marshall" . com wrote in message newsGLGh.388$kf.277@trndny02... Jack said something like: So I ran a little test. Somewhat humid cardboard (sitting in my unheated garage in Seattle in the middle of winter) measures over 100 megohms on my multimeter. Sopping wet cardboard (tapwater) measures 1 megohm. Test points 3" apart although it didn't seem to matter much. Energizer rated at 2850 mah Leakage into wet cardboard would be 1.5/1000= .0015 ma. Time to discharge battery would be 2850/.0015=1.9 million hours or somewhat over 200 years. I suppose the water could have contained more ions than my tap water but knowing that the human body is quite conductive I also checked the resistance across my tongue and found it to be 1/10 that of the cardboard so it would still take over 20 years to discharge the battery. I guess I would look elsewhere for the dead battery gremlin. If you found that it would take 20 years to discharge a battery shorted by your tongue, I'm suspicious that there's a miscalculation or broken metric somewhere. -- Forgetthesong,I'dratherhavethefrontallobotomy... |
#25
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
jasen said something like:
On 2007-03-04, Thomas G. Marshall . com wrote: I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, dig out your magnefying glass, what's the use-by date on those batteries? Were they actually *on* those? There was something that looked like 1/2 pt. type, but I gave up on it.... |
#26
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humidenough?
Eeyore wrote:
Homer J Simpson wrote: "Radiosrfun" wrote in message Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. I can buy an 8 pack for $1 here. They're good. The fake Energizer 12 per pack are total crap. 'Fake' Energisers ? Do they have 'fake' written on them ? Graham Yes, they do if you know how to read. Cheaper construction, lighter materials, paper labels instead of silk-screening. It all says "FAKE" loud and clear. US customs impounds tons of the crappy things every week or so. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#27
Posted to sci.electronics.basics,sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
"Michael A. Terrell" wrote in message
... Eeyore wrote: Homer J Simpson wrote: "Radiosrfun" wrote in message Batteries in bulk are usually pretty cheap. At our local store, I can buy a 4 pack for a $1 - batteries I use often with no issues. OR I can buy a 12 pack for a $1, which I HAVE had issues with - leaking. Price doesn't always dictate quality, but sometimes - it does. I can buy an 8 pack for $1 here. They're good. The fake Energizer 12 per pack are total crap. 'Fake' Energisers ? Do they have 'fake' written on them ? Graham Yes, they do if you know how to read. Cheaper construction, lighter materials, paper labels instead of silk-screening. It all says "FAKE" loud and clear. US customs impounds tons of the crappy things every week or so. Graham, Maybe you've not seen them, though they may not say "Fake" in writing, they ARE "packaged" to look like a brand name. If you didn't look at them closely - you would buy them "assuming" they are "brand name". The ones I've seen, were IDENTICAL to Duracell. There is a HUGE market out there for Knock-offs. Batteries, clothes, watches, CDs, you name it - there is probably one for it. |
#28
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humidenough?
One possibility is they are "NOS", ie. new, old stock, like in 8-10
years old, sitting on some shelf in a little Walgreens store or something, and they finally dumped them. Electronic distributors also get these in 50 and larger cases, without the blister pack. Or maybe the eBay seller took them out of the blister packs because they said "best used before 1998". Jon Thomas G. Marshall wrote: I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to *almost* the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. |
#29
Posted to sci.electronics.misc,alt.electronics
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50 Dying batteries: Can they be shorted by cardboard if humid enough?
Jon Elson said something like:
Thomas G. Marshall wrote: I recently ordered on eBay 100 energizer AA batteries. I tested them using a simple battery tester from radio shack. 4 were dead, one was near death, and 95 were at an identical high mark, but just a "little" below an energizer I bought from a retail package from Home Depot. The tester is simple and unmetered, save for a "75%" mark. The needle moves up to *almost* the same spot as my control (retail) battery does. They were shipped in 2 corrugated cardboard boxes, roughly the height of an AA cell. 50 in each, all standing up on the negative (flat) end. So (especially if they are stacked) the top and bottom of all the batteries are touching the top and bottom of the cardboard box. HUGE speculation: If the cardboard is even minutely conductive (humidity, acidity, or whatever) then I have effectively a wired in parallel 1.5V "50xAA-amp" "battery" that is shorting through its own packaging (?) Is there another possibility for this, other than just lesser quality batteries? And is the cardboard shorting even possible? I'm working with the seller to try to figure this one out. He's asking about possibly putting a plastic or foam sheet above or below them. I'd appreciate your thoughts on all of this. One possibility is they are "NOS", ie. new, old stock, like in 8-10 years old, sitting on some shelf in a little Walgreens store or something, and they finally dumped them. Electronic distributors also get these in 50 and larger cases, without the blister pack. Or maybe the eBay seller took them out of the blister packs because they said "best used before 1998". No, they're mostly dated 2011 and 2012... -- Puzzle: You are given a deck of cards all face down except for 10 cards mixed in which are face up. If you are in a pitch black room, how do you divide the deck into two piles (may be uneven) that each contain the same number of face-up cards? Answer (rot13): Sebz naljurer va gur qrpx, qrny bhg gra pneqf naq syvc gurz bire. |
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