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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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DR202 LI-Ion Battery Dead
I have one of these in my laptop. Its just over a year old. It was left in
the laptop for a few weeks untouched, and seems to have gone flat. It doesn't seem to want to charge up either. It sits at 0% and charging all the time. I have too it out and checked the voltage it reads 6.6v across the + & - pins. Is there anyway I can revive this battery. Also what are the other pins for? they are marked +, C, D,D,T,- in that order. Any help is appreciated. |
#2
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DR202 LI-Ion Battery Dead
Paul Landregan wrote:
I have one of these in my laptop. Its just over a year old. It was left in the laptop for a few weeks untouched, and seems to have gone flat. It doesn't seem to want to charge up either. It sits at 0% and charging all the time. I have too it out and checked the voltage it reads 6.6v across the + & - pins. Is there anyway I can revive this battery. Also what are the other pins for? they are marked +, C, D,D,T,- in that order. Any help is appreciated. Sometimes you can fix 'em by charging up to the correct voltage per cell. Sometimes that resets the protection. Be careful, use low current. There are a zillion technical and safety issues. Know what you're doing before you start. Wear safety glasses. YMMV, don't try this at home. mike -- Bunch of stuff For Sale and Wanted at the link below. laptops and parts Test Equipment Honda CB-125S TEK Sampling Sweep Plugin and RM564 Tek 2465 $800, ham radio, 30pS pulser Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
#3
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DR202 LI-Ion Battery Dead
Paul Landregan wrote:
I have one of these in my laptop. Its just over a year old. It was left in the laptop for a few weeks untouched, and seems to have gone flat. It doesn't seem to want to charge up either. It sits at 0% and charging all the time. I have too it out and checked the voltage it reads 6.6v across the + & - pins. Is there anyway I can revive this battery. Also what are the other pins for? they are marked +, C, D,D,T,- in that order. Any help is appreciated. Sometimes you can fix 'em by charging up to the correct voltage per cell. Sometimes that resets the protection. Be careful, use low current. There are a zillion technical and safety issues. Know what you're doing before you start. Wear safety glasses. YMMV, don't try this at home. mike -- Bunch of stuff For Sale and Wanted at the link below. laptops and parts Test Equipment Honda CB-125S TEK Sampling Sweep Plugin and RM564 Tek 2465 $800, ham radio, 30pS pulser Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
#4
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DR202 LI-Ion Battery Dead
So charging it up in the laptop and leaving it on charge overnight wont do
much? "mike" wrote in message ... Paul Landregan wrote: I have one of these in my laptop. Its just over a year old. It was left in the laptop for a few weeks untouched, and seems to have gone flat. It doesn't seem to want to charge up either. It sits at 0% and charging all the time. I have too it out and checked the voltage it reads 6.6v across the + & - pins. Is there anyway I can revive this battery. Also what are the other pins for? they are marked +, C, D,D,T,- in that order. Any help is appreciated. Sometimes you can fix 'em by charging up to the correct voltage per cell. Sometimes that resets the protection. Be careful, use low current. There are a zillion technical and safety issues. Know what you're doing before you start. Wear safety glasses. YMMV, don't try this at home. mike -- Bunch of stuff For Sale and Wanted at the link below. laptops and parts Test Equipment Honda CB-125S TEK Sampling Sweep Plugin and RM564 Tek 2465 $800, ham radio, 30pS pulser Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
#5
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DR202 LI-Ion Battery Dead
So charging it up in the laptop and leaving it on charge overnight wont do
much? "mike" wrote in message ... Paul Landregan wrote: I have one of these in my laptop. Its just over a year old. It was left in the laptop for a few weeks untouched, and seems to have gone flat. It doesn't seem to want to charge up either. It sits at 0% and charging all the time. I have too it out and checked the voltage it reads 6.6v across the + & - pins. Is there anyway I can revive this battery. Also what are the other pins for? they are marked +, C, D,D,T,- in that order. Any help is appreciated. Sometimes you can fix 'em by charging up to the correct voltage per cell. Sometimes that resets the protection. Be careful, use low current. There are a zillion technical and safety issues. Know what you're doing before you start. Wear safety glasses. YMMV, don't try this at home. mike -- Bunch of stuff For Sale and Wanted at the link below. laptops and parts Test Equipment Honda CB-125S TEK Sampling Sweep Plugin and RM564 Tek 2465 $800, ham radio, 30pS pulser Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
#6
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DR202 LI-Ion Battery Dead
Paul Landregan wrote:
So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike |
#7
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DR202 LI-Ion Battery Dead
Paul Landregan wrote:
So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike |
#8
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DR202 LI-Ion Battery Dead
"mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? |
#9
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DR202 LI-Ion Battery Dead
"mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? |
#10
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DR202 LI-Ion Battery Dead
Paul Landregan wrote:
"mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. -- Bunch of stuff For Sale and Wanted at the link below. laptops and parts Test Equipment Honda CB-125S TEK Sampling Sweep Plugin and RM564 Tek 2465 $800, ham radio, 30pS pulser Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
#11
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DR202 LI-Ion Battery Dead
Paul Landregan wrote:
"mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. -- Bunch of stuff For Sale and Wanted at the link below. laptops and parts Test Equipment Honda CB-125S TEK Sampling Sweep Plugin and RM564 Tek 2465 $800, ham radio, 30pS pulser Tektronix Concept Books, spot welding head... http://www.geocities.com/SiliconValley/Monitor/4710/ |
#12
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DR202 LI-Ion Battery Dead
mike wrote in message ...
Paul Landregan wrote: "mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. Hmm- interesting. I've had some success leaving the battery in a cold shed for a couple of days then charging it; it then seemed to recover most of its capacity. (Acernote Lite AN370C) Needless to say, opening the pack and charging the cells if you don't know EXACTLY what you are doing is a BAD idea, all kinds of risks (Ever seen a Li- battery go into thermal failure? (Hint: "Venting with flame") -A C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. |
#13
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DR202 LI-Ion Battery Dead
mike wrote in message ...
Paul Landregan wrote: "mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. Hmm- interesting. I've had some success leaving the battery in a cold shed for a couple of days then charging it; it then seemed to recover most of its capacity. (Acernote Lite AN370C) Needless to say, opening the pack and charging the cells if you don't know EXACTLY what you are doing is a BAD idea, all kinds of risks (Ever seen a Li- battery go into thermal failure? (Hint: "Venting with flame") -A C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. |
#14
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DR202 LI-Ion Battery Dead
Thanks Andre, never thought of the cold batter theory. I will place it in
the freezer for an hour and see if it makes any difference. "Andre" wrote in message m... mike wrote in message ... Paul Landregan wrote: "mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. Hmm- interesting. I've had some success leaving the battery in a cold shed for a couple of days then charging it; it then seemed to recover most of its capacity. (Acernote Lite AN370C) Needless to say, opening the pack and charging the cells if you don't know EXACTLY what you are doing is a BAD idea, all kinds of risks (Ever seen a Li- battery go into thermal failure? (Hint: "Venting with flame") -A C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. |
#15
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DR202 LI-Ion Battery Dead
Thanks Andre, never thought of the cold batter theory. I will place it in
the freezer for an hour and see if it makes any difference. "Andre" wrote in message m... mike wrote in message ... Paul Landregan wrote: "mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. Hmm- interesting. I've had some success leaving the battery in a cold shed for a couple of days then charging it; it then seemed to recover most of its capacity. (Acernote Lite AN370C) Needless to say, opening the pack and charging the cells if you don't know EXACTLY what you are doing is a BAD idea, all kinds of risks (Ever seen a Li- battery go into thermal failure? (Hint: "Venting with flame") -A C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. |
#16
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DR202 LI-Ion Battery Dead
"Paul Landregan" wrote in message ... Thanks Andre, never thought of the cold batter theory. I will place it in the freezer for an hour and see if it makes any difference. "Andre" wrote in message m... mike wrote in message ... Paul Landregan wrote: "mike" wrote in message ... Paul Landregan wrote: So charging it up in the laptop and leaving it on charge overnight wont do much? Are you saying you didn't try that? If you did, you know the answer. mike I suppose I do. I have tried applying a 12v supply across the + and - terminals, the current draw was around 6mA. I am maybe thinking the charge pin is the one maked C. Is this correct? Yep, I had the same problem with a battery. Could get current out, but not in, Had separate fet switches inside. I had to open the pack, charge the cells individually, download the spec for the processor and reverse engineer the design. Turned out they used a latching reset that disabled the processor. Forced the reset high and it stayed there and the battery worked. I got lucky. Hmm- interesting. I've had some success leaving the battery in a cold shed for a couple of days then charging it; it then seemed to recover most of its capacity. (Acernote Lite AN370C) Needless to say, opening the pack and charging the cells if you don't know EXACTLY what you are doing is a BAD idea, all kinds of risks (Ever seen a Li- battery go into thermal failure? (Hint: "Venting with flame") -A C might be clock for the digital interface. It's not unusual for the battery to discuss it's condition with the laptop before charging is enabled. If it is, you wouldn't want to stuff charge voltage into it. Battey has come out of the freezer after being in there for 4 hours. Its really cold. Placed in laptop will report back if it was charged at all. |
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