I was looking for a battery app that would limit the charge on a phone that is always plugged in when I found the Chargie. https://chargie.org/
It is a device that sits between your phone, or other device, and can limit the charge to the device to maximize battery health. I figured this would be good for an old phone I plan to use just as an alarm clock. The last phone I did this with lasted a few years before the battery swelled and popped the screen out of the case.
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If this works as advertised, I needed it yesterday. I kinda hate that the only reason I felt forced to get a Pixel 5a before I could see pricing and specs on the Pixel 6 was because my 3a’s battery was starting to swell.
Hell, I used the device protection thing with my OG Pixel at some point for the same reason, and and the refurbished replacement had the same issue when the 3a came out.