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Comment by rollcat | Hacker News Reader

You don't need to continue charging the battery past given percentage. It just happens that by default batteries don't charge past 100%, you can tell the firmware to stop at e.g. 40% which is a perfect compromise between having a bit of backup power and considerably extending its lifespan.

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Is there a standardised way to do that on old Android devices? I've got a tablet that I'd like to run continuously at some point as a touch interface to my house but I'm wary if hooking up the battery 24/7 after seeing what happened to other people's devices when they did that.

I've been using this fantastic work for years without side effects

https://github.com/Magisk-Modules-Repo/acc

I had my phone plugged in for almost 3 years, and the battery still lasts for 3 days on its own. Highly recommended.

As a side note, can someone tell me if something like this can be made for postmarketOS? I installed it couple months back and this is really bugging me. Apart from constant vibrations.

> As a side note, can someone tell me if something like this can be made for postmarketOS? I installed it couple months back and this is really bugging me.

In theory, if changing charge thresholds is supported by the PMIC (power-management IC) driver, it should be exposed in the sysfs. It is device-specific though, and might not be exposed by the driver.

Charge your battery to 40%, so that it will be able to charge to 100% for more charging cycles...

I know you're joking, but I've seen this logic at play elsewhere.

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