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Thinkpad batteries can not be repaired?
Thinkpad batteries can not be repaired?
I just disassembled and charged by thinkpad battery using a lab power supply up to 13.1 volts. It takes voltage nicely. If you leaving it alone after charging, it does not loose it. But when I stick it into laptop, laptop says battery is fully discharged... Even though battery is charged.
What's happening here?
Am I correct to assume that battery has firmware that says battery is dead?
OR
I have to disassembled each of 9 cells and check them one by one? (I don't think there will be a point in doing that, since they all appear to be good, and they charged up nicely)
HELLLPPP!!!
What's happening here?
Am I correct to assume that battery has firmware that says battery is dead?
OR
I have to disassembled each of 9 cells and check them one by one? (I don't think there will be a point in doing that, since they all appear to be good, and they charged up nicely)
HELLLPPP!!!
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- Senior ThinkPadder
- Posts: 3832
- Joined: Mon May 28, 2012 5:49 am
- Location: Metro Manila, Philippines
Re: Thinkpad batteries can not be repaired?
Laptop battery packs have a BMS (battery management system). Lithium cells self-discharge over time, and when its voltage drops to 0v (or a sufficiently low voltage), a safety device in the BMS detects this and trips. When the battery pack is charged again, the BMS detects the tripped safety and prevents it from being charged.
Planned Purchase: T480s i5-8350 FHD Touch
Impulse Buy: Thinkpad not named for safety reasons
RIP: X220 4291-C91 X61 7676-A24 760XD-U9E
Impulse Buy: Thinkpad not named for safety reasons
RIP: X220 4291-C91 X61 7676-A24 760XD-U9E
Re: Thinkpad batteries can not be repaired?
How to circumvent this evilness? W520 battery..axur-delmeria wrote: ↑Sat Dec 07, 2019 4:49 amLaptop battery packs have a BMS (battery management system). Lithium cells self-discharge over time, and when its voltage drops to 0v (or a sufficiently low voltage), a safety device in the BMS detects this and trips. When the battery pack is charged again, the BMS detects the tripped safety and prevents it from being charged.
I'm penny pinching here, can't afford a cheap battery from china... Yet.
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- Senior ThinkPadder
- Posts: 3832
- Joined: Mon May 28, 2012 5:49 am
- Location: Metro Manila, Philippines
Re: Thinkpad batteries can not be repaired?
That evilness is "erring on the side of caution" unless you want your battery to explode or catch fire.
I don't know the specifics, but whatever needs to be done to get it to start charging requires cracking open the battery pack's plastic shell, and most likely replacing a certain component.
I don't know the specifics, but whatever needs to be done to get it to start charging requires cracking open the battery pack's plastic shell, and most likely replacing a certain component.
Planned Purchase: T480s i5-8350 FHD Touch
Impulse Buy: Thinkpad not named for safety reasons
RIP: X220 4291-C91 X61 7676-A24 760XD-U9E
Impulse Buy: Thinkpad not named for safety reasons
RIP: X220 4291-C91 X61 7676-A24 760XD-U9E
Re: Thinkpad batteries can not be repaired?
I got the cracking case open thingy, there is no problem with that.
Tell me what component to replace?
I even have eprom programmer and can modify any kind of firmware it has on that board, just tell me how to do it.
Let's be realistic, if I order this same type of battery from aliexpress, chances of it weighting the same are 50/50 or less. Meaning, it won't be as good as the original one. And you are wrong about battery catching fire and stuff like that, I never throw laptop batteries away, I always take them apart, and take elements out. Battery might have one or two elements bad, the rest will be good and can be reused. For example you can stick them into laser sight for your rifle and stuff like that. Those elements are even better than what you can buy at the store.
Tell me what component to replace?
I even have eprom programmer and can modify any kind of firmware it has on that board, just tell me how to do it.
Let's be realistic, if I order this same type of battery from aliexpress, chances of it weighting the same are 50/50 or less. Meaning, it won't be as good as the original one. And you are wrong about battery catching fire and stuff like that, I never throw laptop batteries away, I always take them apart, and take elements out. Battery might have one or two elements bad, the rest will be good and can be reused. For example you can stick them into laser sight for your rifle and stuff like that. Those elements are even better than what you can buy at the store.
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- Senior ThinkPadder
- Posts: 2670
- Joined: Sun Aug 09, 2015 9:25 am
- Location: N. Bellmore, ny
Re: Thinkpad batteries can not be repaired?
Batteries don't catch fire? Force a charge into a dead cell and you end up exploding the cell. That's why they go fully dead when a cell goes bad. Not so great for your company if your Lithium batteries explode....just ask Dell with their 2004-2006 laptops, Samsung and the Galaxy Note 7, Lenovo Thinkpad batteries from 2006-2008, HP, Apple, Toshiba, Tesla, and many more companies.u666sa wrote: ↑Sun Dec 08, 2019 3:17 amI got the cracking case open thingy, there is no problem with that.
Tell me what component to replace?
I even have eprom programmer and can modify any kind of firmware it has on that board, just tell me how to do it.
Let's be realistic, if I order this same type of battery from aliexpress, chances of it weighting the same are 50/50 or less. Meaning, it won't be as good as the original one. And you are wrong about battery catching fire and stuff like that, I never throw laptop batteries away, I always take them apart, and take elements out. Battery might have one or two elements bad, the rest will be good and can be reused. For example you can stick them into laser sight for your rifle and stuff like that. Those elements are even better than what you can buy at the store.
Very few batteries have dumped EEPROMs...there is a way on T4x batteries to jump start them and possibly retrain them but I doubt it on the newer packs. Could always try it.
Thinkpad4by3's Law of the Universe.
The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.
The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.
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