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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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reparing battery pack
Phil Allison wrote:
"LSMFT" When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? ** Nope. But it will take proportionally longer to charge as the mAh rating goes up. BTW: Who makes 4000mAh Ni-Cds in C size ?? .... Phil Just because you don't know who makes them doesn't mean they don't exist. You can also say, "Nobody pounded their pud at the Post Office" but that doesn't mean that Sitre Magana wasn't caught beating off at the Post Office. |
#2
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reparing battery pack
When I rebuild my drill battery pack with new C nicads do I have to stay
in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? -- LSMFT Force ****s upon the Back of Reason... Ben Franklin- |
#3
Posted to sci.electronics.repair
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reparing battery pack
"LSMFT" When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? ** Nope. But it will take proportionally longer to charge as the mAh rating goes up. BTW: Who makes 4000mAh Ni-Cds in C size ?? ..... Phil |
#4
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reparing battery pack
"Stephany Alexander" Phil Allison wrote: "LSMFT" When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? ** Nope. But it will take proportionally longer to charge as the mAh rating goes up. BTW: Who makes 4000mAh Ni-Cds in C size ?? Just because you don't know who makes them doesn't mean they don't exist. ** Giant HUH ???????? I already found that Sanyo make 3600mAh Ni-Cd cells in C size. Fast charge types too - very cool cells. ...... Phil |
#5
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reparing battery pack
On Sat, 05 Mar 2011 22:05:21 -0500, LSMFT wrote:
When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Better question, will it charge with the stock charger. -- Live Fast, Die Young and Leave a Pretty Corpse |
#6
Posted to sci.electronics.repair
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reparing battery pack
When I rebuild my drill battery pack with new C nicads
do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Better question, will it charge with the stock charger? It should, unless the stock charger /required/ special cells for rapid charge, or some other condition. Using NiMH cells should eliminate any problem, as they (generally) tolerate rapid charging. I used regular NiMH cells for a Polaroid #365 electronic flash, and the #363 rapid charger handles them fine, even though it was designed for rapid-charge nicads. |
#7
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reparing battery pack
LSMFT wrote in
: When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? No,they will not hurt your drill,as long as the pack voltage remains the same. it will draw the current it needs,and no more. Makita switched their packs from NiCd to NiMH for an increase in run time,NiMH having more mAH,a higher energy density than NiCd. the drills stayed the same,the charger is where the difference is,for the different battery chemistry. NiMH have to be charged differently than NiCds. NiMH are better cells,IMO. they keep a charge longer,besides their higher mAH. I've never seen 4000mAH sub-C NiCd cells,who makes them? -- Jim Yanik jyanik at localnet dot com |
#8
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reparing battery pack
When I rebuild my drill battery pack with new C nicads do I have to stay
in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? I'd read somewhere that as mA rating goes up for a given cell size the insulators get thinner and the battery is more at risk from heat (during charge and discharge) than lower mA cells. Someone more knowledgeable re. battery chemistry can probably answer here or at sci.chem.electrochem.battery Good luck. |
#9
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reparing battery pack
On Sun, 06 Mar 2011 09:57:07 -0800, William Sommerwerck wrote:
When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Better question, will it charge with the stock charger? It should, unless the stock charger /required/ special cells for rapid charge, or some other condition. Using NiMH cells should eliminate any problem, as they (generally) tolerate rapid charging. I used regular NiMH cells for a Polaroid #365 electronic flash, and the #363 rapid charger handles them fine, even though it was designed for rapid-charge nicads. I'd be cautious of the charger meeting the requirements of 2300 mAh cells without it struggling. Been dealing with these issues for many years in battery packs for my handy talkies. I have a spare 7.2v 1400 mAh pack for my Vertex FT-60. It won't charge slow but drop it in the rapid charger and it charges just fine. Doesn't make much sense. I own a Maha multi charger that uses a temp probe placed on the cells to help decide the charge. I switched to all NMiH AAA cells for our keyboards/mice hand held GPS etc.. Two chargers ant 4 packs of 2300 mAh cells. Smartest thing I've done in awhile. -- Live Fast, Die Young and Leave a Pretty Corpse |
#10
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reparing battery pack
On Mar 5, 9:05*pm, LSMFT wrote:
When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? -- LSMFT Force ****s upon the Back of Reason... Ben Franklin- No, the higher maH means the drill will run longer on a fully charged battery. Keep an eye on the charger overheating the first few times you use the new pack as it will draw a little more current from the charger and will also have to charge longer to fully charge the higher capacity batteries. |
#11
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reparing battery pack
Using NiMH cells should eliminate any problem, as they (generally)
tolerate rapid charging. I used regular NiMH cells for a Polaroid #365 electronic flash, and the #363 rapid charger handles them fine, even though it was designed for rapid-charge nicads. I'd be cautious of the charger meeting the requirements of 2300 mAh cells without it struggling. The charger doesn't "know" the cell's capacity. It just pumps current into it. The better class of chargers shuts off when a particular cell voltage (and/or some other condition) has been reached. Been dealing with these issues for many years in battery packs for my handy talkies. I have a spare 7.2v 1400 mAh pack for my Vertex FT-60. It won't charge slow but drop it in the rapid charger and it charges just fine. Doesn't make much sense. I own a Maha multi charger that uses a temp probe placed on the cells to help decide the charge. I have two MAHA C9000 chargers. I wish they'd been available 40 years ago. |
#12
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reparing battery pack
On Sun, 06 Mar 2011 12:47:53 -0800, William Sommerwerck wrote:
Using NiMH cells should eliminate any problem, as they (generally) tolerate rapid charging. I used regular NiMH cells for a Polaroid #365 electronic flash, and the #363 rapid charger handles them fine, even though it was designed for rapid-charge nicads. I'd be cautious of the charger meeting the requirements of 2300 mAh cells without it struggling. The charger doesn't "know" the cell's capacity. It just pumps current into it. The better class of chargers shuts off when a particular cell voltage (and/or some other condition) has been reached. If it's just a brainless charge that's correct. Been dealing with these issues for many years in battery packs for my handy talkies. I have a spare 7.2v 1400 mAh pack for my Vertex FT-60. It won't charge slow but drop it in the rapid charger and it charges just fine. Doesn't make much sense. I own a Maha multi charger that uses a temp probe placed on the cells to help decide the charge. I have two MAHA C9000 chargers. I wish they'd been available 40 years ago. Forget the model of mine. It was a model probably circa 1996 because AES had just started to advertise their products. It wasn't something to just pop 4 AAA cells into. It could charge several different styles. I don't use it these days since I've bought drop in rapid chargers. It's at my office in the basement with the rest of my junk or I'd give the model. -- Live Fast, Die Young and Leave a Pretty Corpse |
#13
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reparing battery pack
The charger doesn't "know" the cell's capacity. It just
pumps current into it. The better class of chargers shuts off when a particular cell voltage (and/or some other condition) has been reached. If it's just a brainless charge, that's correct. I'm so accustomed to 0.1C charging that I rarely set the C9000 for greater than 0.3C -- even though 0.5C charges are /recommened/ by MAHA for its own cells. I'm afraid of overheating the cells. The C9000 can do a lot of useful stuff -- break in new cells, rejuvenate old cells (supposedly), and measure cell capacity. The latter is useful for assembling packs with closely matched cells. You should also check capacity when you buy cells, as they're sometimes out of spec. (MAHA says the tolerance is +/- 10% of the rated value. MAHA will replace low-capacity cells.) |
#14
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reparing battery pack
LSMFT wrote:
When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Nope. My friend Ryan Morris tells me that if you replace it with 4000mAh cells, you will giving it 4000mA when it was only designed to take 1300mA. |
#15
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reparing battery pack
"Sitre Josephenne Magana" wrote in message
... LSMFT wrote: When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Nope. My friend Ryan Morris tells me that if you replace it with 4000mAh cells, you will giving it 4000mA when it was only designed to take 1300mA. I would not seek electrical advise from that friend in the future. David |
#16
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On Tue, 08 Mar 2011 12:47:08 +0000, Sitre Josephenne Magana wrote:
LSMFT wrote: When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Nope. My friend Ryan Morris tells me that if you replace it with 4000mAh cells, you will giving it 4000mA when it was only designed to take 1300mA. You need to get a new friend.... |
#17
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Spamm Trappe Inscribed thus:
On Tue, 08 Mar 2011 12:47:08 +0000, Sitre Josephenne Magana wrote: LSMFT wrote: When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Nope. My friend Ryan Morris tells me that if you replace it with 4000mAh cells, you will giving it 4000mA when it was only designed to take 1300mA. You need to get a new friend.... I agree ! -- Best Regards: Baron. |
#18
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reparing battery pack
Phil Allison wrote:
"Stephany Alexander" Phil Allison wrote: "LSMFT" When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? ** Nope. But it will take proportionally longer to charge as the mAh rating goes up. BTW: Who makes 4000mAh Ni-Cds in C size ?? Just because you don't know who makes them doesn't mean they don't exist. ** Giant HUH ???????? I already found that Sanyo make 3600mAh Ni-Cd cells in C size. Fast charge types too - very cool cells. ..... Phil NIMH RECHARGEABLE C-CELL -- 5000 MAH High-capacity 5000 mAh rechargeable nickel-metal hydride C-cell. 1.2V. 26mm diameter x 50mm long. Standard charge, 16 Hours @ 300mA. Rapid charge, 2 Hours @ 3000 mA. Read more CAT# NMH-C $5.65 each This is at All Electronics online catalog. -- LSMFT Force ****s upon the Back of Reason... Ben Franklin- |
#19
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reparing battery pack
"LSMFT" Phil Allison wrote: BTW: Who makes 4000mAh Ni-Cds in C size ?? Just because you don't know who makes them doesn't mean they don't exist. ** Giant HUH ???????? I already found that Sanyo make 3600mAh Ni-Cd cells in C size. Fast charge types too - very cool cells. NIMH RECHARGEABLE C-CELL -- 5000 MAH High-capacity 5000 mAh rechargeable nickel-metal hydride C-cell. ** Shame that ain't a Ni-Cd cell....... NiMH cells have up to 4 times the capacity of Ni-Cds, at least in AA size. ...... Phil |
#20
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reparing battery pack
On 03/08/2011 12:47 PM, Sitre Josephenne Magana wrote:
LSMFT wrote: When I rebuild my drill battery pack with new C nicads do I have to stay in the same mAh rating. The originals are 1300mAh, I can replace them with 2300mAh cells with tabs. Or even 4000mAh ones. Will more mAh hurt the drill? Nope. My friend Ryan Morris tells me that if you replace it with 4000mAh cells, you will giving it 4000mA when it was only designed to take 1300mA. Ryan Morris ain't your friend. As a matter of fact, he banned you from his website for posting stupid gas ass **** on his forums. What's Next, You're going to claim that Dennis the weight trainer is your best friend even though you kicked his knee and he punched your fat face like 4 times and knocked you out? |
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