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Comment by ev1 | Hacker News Reader

What's keeping a plugged in unremovable battery charging on power 24/7 like

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.

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.

Doesn't the battery controller bypass the battery once it's full and supply power directly from cable?

I've never heard of a phone that does this.

I wish I could find a power bank for USB devices that will just pass through power when the battery is full.

Depends. If the power source is decent enough, it's fine. If not, you'll end up with a swollen battery, like I did, and you'll get rid of it as fast as possible.

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