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What voltage does your thinkpad charge the battery to? (lemmy.ml)

submitted 3 months ago* (last edited 3 months ago) by fl42v@lemmy.ml to c/thinkpad@lemmy.ml

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I've replaced cells in my fake battery a few days ago, and while recalibrating the bms I noticed what looked like it trying to overcharge the cells -- the voltage went up to above 12.6v and stabilized at around 12.9 (which amounts to ~4.3v per cell and is 0.1v above what cell manufacturers generally recommend). Idk if that's the intended behavior or clone manufacturers trying to shorten the lifetime of said batteries, so if the owners with genuine batteries can provide that info, I'd really appreciate it.

On linux, you can check this with cat /sys/class/power_supply/BAT*/voltage_now (as your usual user, those files are world-readable); not sure about windows, tho.

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[–] fuckwit_mcbumcrumble@lemmy.dbzer0.com 3 points 3 months ago

Some lithium ion batteries are rated for 4.3v instead of the normal 4.2v. The trade off is their minimum voltage is also about 0.1v higher than their 4.2v counterparts.

[–] eskimofry@lemm.ee 2 points 3 months ago* (last edited 3 months ago)

My company Lenovo T14 Gen 2i is running windows 11. Inside lenovo vantage I can see the voltage at 85% is 12.55v. I have enabled the charge threshold setting to cap the battery to 85%.