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| restoring Li Ion batteries |
Posted by: AlpineRaven on 2019-03-04 14:02:27
Hiya all,
Has anyone ever tried restoring/rebuild/wake up Li Ion batteries from PowerBooks? I have a few of PowerBook batteries and recently I got one battery brought back from dead and others aren't working at all.
Someone advised to jump start/shock start the batteries with small spike charge to get them woken up.
Well aware - it could be dangerous procedure, he used an old galvanised toolboxn incase it explodes.
Cheers
AP
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Posted by: trigf on 2019-03-05 09:52:05
Once a Lithium Ion battery has deep discharged, it's pretty much done for.
Why not just send it to Batteryrefill.com for a refurbishment?
http://www.batteryrefill.com/laptops/apple/
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Posted by: pcamen on 2019-03-06 05:30:33
Why not just send it to Batteryrefill.com for a refurbishment?
http://www.batteryrefill.com/laptops/apple/ All indications are that they are defunct. I tried to place an order a couple of months back and got a bounce that indicated their mailbox was full, as did all my other contact emails. Calls to their number went to voice mail which was never returned.
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Posted by: AichEss on 2019-03-27 16:16:30
These people pop up every once in a while.
https://www.resellerratings.com/store/eBattery_Inc_8
They haven't improved over the years.
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Posted by: Franklinstein on 2019-03-29 02:20:53
Because of their sensitivity and volatility vs. lead acid, NiCD, or NiMH-based batteries, LiIon packs require management chips to monitor various parameters such as temperature, charge and discharge voltages, and charge cycles. Some of these management chips will disallow charging once cell voltages go too low and/or charge cycles exceed a certain value, and there's no way to reset them; the packs are rendered effectively useless. Someone with more specific knowledge may be able to comment on specific battery packs, such as those from a 3400 maybe being more receptive to rebuilding vs. a late PGB4 pack, but generally they should be replaced rather than re-celled.
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Posted by: Zippy Zapp on 2019-04-22 11:36:07
Bummer. I am in need of a G3 Wallstreet and a Lombard battery and they are impossible to find as it seems no one makes a replacement.
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Posted by: AlpineRaven on 2019-04-22 15:38:35
Bummer. I am in need of a G3 Wallstreet and a Lombard battery and they are impossible to find as it seems no one makes a replacement. They are around - you gotta look and look for new old stock
Cheers
AP
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Posted by: techknight on 2019-04-22 16:17:35
Because of their sensitivity and volatility vs. lead acid, NiCD, or NiMH-based batteries, LiIon packs require management chips to monitor various parameters such as temperature, charge and discharge voltages, and charge cycles. Some of these management chips will disallow charging once cell voltages go too low and/or charge cycles exceed a certain value, and there's no way to reset them; the packs are rendered effectively useless. Someone with more specific knowledge may be able to comment on specific battery packs, such as those from a 3400 maybe being more receptive to rebuilding vs. a late PGB4 pack, but generally they should be replaced rather than re-celled.
Some batteries have an EEPROM and you can "revirginize" a smart battery pack. ONCE you replace the cells, that is. Newer batteries are I2C/SPI SMBus and special software can be used to reset the microcontroller. Older batteries, need to be more invasive.
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