![]() It's not nearly as bad as some urban legends would have you believe.Ĭlarification: True 0V discharge kills Li-ion cells and you If that was true there would've been a lot more cases of batteries setting houses on fire back in the early 2000s as "0V deep discharge recovery" used to be a feature in some laptop battery pack controllers back then. Some people will say "Well that's by design, a single overdischarge turns Li-Ion cells into potential fire-bombs!" Trying to charge the battery in the laptop resulted in a rapidly flashing charge LED indicating charge failure. Querying the controller reveals it's had 43 charge/discharge cycles so the cells are practically new! And yet the controller was in permanent lockout mode due to a single overdischarge condition getting logged. ![]() So why would you want to mess with a smart battery controller anyway?Ĭonsider the case of one ThinkPad X100e I purchased a few months ago. (Aside from a few outtakes from chinese developer forums) Usually the chips' datasheets aren't even publicly available. ![]() Looking around there's very little software available out there for working with battery controllers in general and most of them cost hundreds or even thousands of dollars. Having gone deep down the rabbit hole of researching smart laptop battery controllers I've ended up reverse engineering a couple of them used in ThinkPad batteries.
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