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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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3V AA sized rechargeable battery???
We have a solar powered alarm clock which automatically synchronises with
the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. |
#2
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3V AA sized rechargeable battery???
"Steve" wrote in message ... We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. Any sign of damage to the PCB from the leaking electrolyte? I think you are reading too much into the 1.5 terminal voltage with no load. -- Graham. %Profound_observation% |
#3
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3V AA sized rechargeable battery???
"Graham." wrote in message ... "Steve" wrote in message ... We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. Any sign of damage to the PCB from the leaking electrolyte? I think you are reading too much into the 1.5 terminal voltage with no load. -- Graham. %Profound_observation% Thanks for replying Graham. There's no damage to the PCB. Also, I've never seen a rechargeable with 1.5V (even under no load); the battery (I should say 'cell' really) is the most likely cause of the problem. I may risk conecting a couple of 'normal' AAs in series and see what happens. Cheers |
#4
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3V AA sized rechargeable battery???
Steve wrote:
"Graham." wrote in message ... "Steve" wrote in message ... We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. Any sign of damage to the PCB from the leaking electrolyte? I think you are reading too much into the 1.5 terminal voltage with no load. -- Graham. %Profound_observation% Thanks for replying Graham. There's no damage to the PCB. Also, I've never seen a rechargeable with 1.5V (even under no load); the battery (I should say 'cell' really) is the most likely cause of the problem. I may risk conecting a couple of 'normal' AAs in series and see what happens. Cheers plenty of batteries of the non rechargeable sort have 3v voltage..LIPO are about 3.7 in the rechargeable arena, and LiFePo are about 3.3. But I don't think any 3.3v rechargeables come in AAA format. More likely the whole unit is a con, and its a non rechargeable battery that is actually being slightly recharged by the solar power. However I am puzzled: for reasons of cmapitbility, most AAA cells are of similar voltage. |
#5
Posted to uk.d-i-y
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3V AA sized rechargeable battery???
"The Natural Philosopher" wrote in message ... Steve wrote: "Graham." wrote in message ... "Steve" wrote in message ... We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. Any sign of damage to the PCB from the leaking electrolyte? I think you are reading too much into the 1.5 terminal voltage with no load. -- Graham. %Profound_observation% Thanks for replying Graham. There's no damage to the PCB. Also, I've never seen a rechargeable with 1.5V (even under no load); the battery (I should say 'cell' really) is the most likely cause of the problem. I may risk conecting a couple of 'normal' AAs in series and see what happens. Cheers plenty of batteries of the non rechargeable sort have 3v voltage..LIPO are about 3.7 in the rechargeable arena, and LiFePo are about 3.3. But I don't think any 3.3v rechargeables come in AAA format. More likely the whole unit is a con, and its a non rechargeable battery that is actually being slightly recharged by the solar power. However I am puzzled: for reasons of cmapitbility, most AAA cells are of similar voltage. Triple A? Would you care to borrow my glasses? -- Tinkerer |
#6
Posted to uk.d-i-y
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3V AA sized rechargeable battery???
Tinkerer wrote:
"The Natural Philosopher" wrote in message ... Steve wrote: "Graham." wrote in message ... "Steve" wrote in message ... We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. Any sign of damage to the PCB from the leaking electrolyte? I think you are reading too much into the 1.5 terminal voltage with no load. -- Graham. %Profound_observation% Thanks for replying Graham. There's no damage to the PCB. Also, I've never seen a rechargeable with 1.5V (even under no load); the battery (I should say 'cell' really) is the most likely cause of the problem. I may risk conecting a couple of 'normal' AAs in series and see what happens. Cheers plenty of batteries of the non rechargeable sort have 3v voltage..LIPO are about 3.7 in the rechargeable arena, and LiFePo are about 3.3. But I don't think any 3.3v rechargeables come in AAA format. More likely the whole unit is a con, and its a non rechargeable battery that is actually being slightly recharged by the solar power. However I am puzzled: for reasons of cmapitbility, most AAA cells are of similar voltage. Triple A? Would you care to borrow my glasses? Think I need to..:-) Mea culpa! |
#7
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3V AA sized rechargeable battery???
On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html |
#8
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3V AA sized rechargeable battery???
"Gareth" wrote in message o.uk... On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html Thanks Gareth. The 1.6V was with the battery removed. The Li-ion ones you identify look interesting; you may have hit the nail on the head. As I said to Graham (previous post) I may try connecting a couple of normal AAs in series to check if 3V does the job. If so, a Li-ion should work well. Cheers |
#9
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3V AA sized rechargeable battery???
On 04/12/2010 23:50, Steve wrote: "Gareth" wrote in message o.uk... On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html Thanks Gareth. The 1.6V was with the battery removed. The Li-ion ones you identify look interesting; you may have hit the nail on the head. As I said to Graham (previous post) I may try connecting a couple of normal AAs in series to check if 3V does the job. If so, a Li-ion should work well. As I said, you do need to be sure that your clock was designed to work with a lithium ion cell as they can burst into flames if incorrectly charged. If you do try it, make sure you get cells with built in protection modules and don't blame me if your house burns down. Gareth. |
#10
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3V AA sized rechargeable battery???
snip
As I said, you do need to be sure that your clock was designed to work with a lithium ion cell as they can burst into flames if incorrectly charged. If you do try it, make sure you get cells with built in protection modules and don't blame me if your house burns down. Idiot boy questions for my education : might it have been an "ordinary" lithium battery - i.e. not rechargeable? Unless the paperwork specified the "solar" recharged a battery might it have been cheaper for the manufacturer to stick a non-rechargeable in given the likely long life with such a device - i.e. well beyond any reasonable claim for a refund under the Sale of Gods Act? Would the presence of a charging voltage and current from the clock (when in bright light) be one test? -- Robin PM may be sent to rbw0{at}hotmail{dot}com |
#11
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3V AA sized rechargeable battery???
"Robin" wrote in message ... snip As I said, you do need to be sure that your clock was designed to work with a lithium ion cell as they can burst into flames if incorrectly charged. If you do try it, make sure you get cells with built in protection modules and don't blame me if your house burns down. Idiot boy questions for my education : might it have been an "ordinary" lithium battery - i.e. not rechargeable? Unless the paperwork specified the "solar" recharged a battery might it have been cheaper for the manufacturer to stick a non-rechargeable in given the likely long life with such a device - i.e. well beyond any reasonable claim for a refund under the Sale of Gods Act? Would the presence of a charging voltage and current from the clock (when in bright light) be one test? -- Robin PM may be sent to rbw0{at}hotmail{dot}com Yes, it could have been a non-rechargeable lithium battery. However there is a voltage from the solar cell when in daylight (2.6V, no load, not direct sunlight) though this is not enough to drive the clock. So I suspect the recharging mechanism is actually present. (I can't measure the current through the clock without 'breaking-open' the circuit (ammeter must be ins series), which I don't want to do.) Cheers Cheers. |
#12
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3V AA sized rechargeable battery???
In message , Gareth
wrote As I said, you do need to be sure that your clock was designed to work with a lithium ion cell as they can burst into flames if incorrectly charged. If you do try it, make sure you get cells with built in protection modules and don't blame me if your house burns down. Is it a rechargeable battery or just a lithium (long life) cell designed(?) to run the clock for 10 years, supplemented by the solar cell only when there is enough light? If it is the latter then there should be no problem with recharging. http://cpc.farnell.com/varta/craa/ba...-3v/dp/BT01078 -- Alan news2009 {at} admac {dot} myzen {dot} co {dot} uk |
#13
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3V AA sized rechargeable battery???
"Alan" wrote in message ... In message , Gareth wrote As I said, you do need to be sure that your clock was designed to work with a lithium ion cell as they can burst into flames if incorrectly charged. If you do try it, make sure you get cells with built in protection modules and don't blame me if your house burns down. Is it a rechargeable battery or just a lithium (long life) cell designed(?) to run the clock for 10 years, supplemented by the solar cell only when there is enough light? If it is the latter then there should be no problem with recharging. http://cpc.farnell.com/varta/craa/ba...-3v/dp/BT01078 -- Alan news2009 {at} admac {dot} myzen {dot} co {dot} uk It's nmarked (so can't tell if it's rechargeable or not). The cell in your link may do the job. Cheers |
#14
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3V AA sized rechargeable battery???
"Gareth" wrote in message
o.uk... On 04/12/2010 23:50, Steve wrote: "Gareth" wrote in message o.uk... On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html Thanks Gareth. The 1.6V was with the battery removed. The Li-ion ones you identify look interesting; you may have hit the nail on the head. As I said to Graham (previous post) I may try connecting a couple of normal AAs in series to check if 3V does the job. If so, a Li-ion should work well. As I said, you do need to be sure that your clock was designed to work with a lithium ion cell as they can burst into flames if incorrectly charged. If you do try it, make sure you get cells with built in protection modules and don't blame me if your house burns down. Gareth. Thanks Gareth. Noted!!! |
#15
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3V AA sized rechargeable battery???
Gareth wrote:
On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html try LiFe cells. Not sure if AA available. |
#16
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3V AA sized rechargeable battery???
"The Natural Philosopher" wrote in message ... Gareth wrote: On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html try LiFe cells. Not sure if AA available. Lithium-Iron is available in AA, but is only 1.5V. http://ly.rsdelivers.com/product/ene...v/1966692.aspx |
#17
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3V AA sized rechargeable battery???
Steve wrote:
Lithium-Iron is available in AA, but is only 1.5V. http://ly.rsdelivers.com/product/ene...v/1966692.aspx Or less than 1/3 of the RS price http://www.needbatteries.co.uk/energizer-lithium-27-c.asp |
#18
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3V AA sized rechargeable battery???
"The Natural Philosopher" wrote in message ... Gareth wrote: On 04/12/2010 20:35, Steve wrote: We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). Was that with it in circuit of after you removed it? If it was in circuit and being charged when you measured it then 1.6v may be correct for a normal AA rechargeable battery. Lithium ion batteries are around 3V when discharged and 4.2V when fully charged. The 14500 lithium ion cells are AA sized (14500 = 14mm diameter and 50mm long). However, beware that lithium ion cells can burst in to flames if incorrectly charged so you want to be sure it should be lithium ion before fitting one. If you do fit one, I would recommend that you buy a battery with the protection module built in. These came up after a quick Google: http://www.ecrater.co.uk/p/9751735/t...ttery-900mah-2 http://ant-supplies.co.uk/Rechargabl...teries14500tf1 http://www.ledfiretorches.co.uk/batt...batteries.html try LiFe cells. Not sure if AA available. NiZn cells are 1.65v and rechargeable. They are reputed to come in AA size but I've never knowingly ever seen one. -- Graham. %Profound_observation% |
#19
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3V AA sized rechargeable battery???
"Steve" wrote in message ... We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). I presume the battery is the source of the problem. I tried replacing the battery with both rechargeable and non-reachargeable AA ones, but the unit still didn't work. I suspect that the original battery was much more than 1.6V - maybe 3V? But I can't find any references to rechargeable AA-sized 3V batteries. Can anyone suggest where to get a replacement battery (or other ideas)? Cheers. It is probably a Lithium Thionyl Chloride which have a terminal voltage of 3.6V. You can get them in both 1/2 AA and full AA sizes. Try Budget batteries http://www.budgetbatteries.co.uk/ind...onyl-chloride/ Phil |
#20
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3V AA sized rechargeable battery???
Steve wrote:
We have a solar powered alarm clock which automatically synchronises with the terrestrial time signal. The clock is marked 'PRECISION', 'SOLAR POWER' and 'RADIO CONTROLLED'. The display became faint and eventually it stopped working. I took a look inside. There was an unmarked AA size battery (leaking blue liquid which I cleaned up). I measured the battery's voltage which was 1.6V, well above that of a normal rechargeable (1.2V?). How heavy is this? NiCd and NiMH batteries are considerably heavier than lithium of any sort. I would - as others have suggested suspect a 3V lithium non-rechargable battery - simply as rechargable lithium are more expensive. |
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