16
Open Source Alternatives to Accubattery?
(sh.itjust.works)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
All of those only works on specific phone models. So choose the one matches your device.
Really, i don't find any difference on using it and not using it. Both time battery consumption are just same.
Yeah, the model specific ones are a pain to actually start using. It seems like a general case problem though - every phone on the planet needs a battery so it only makes sense every phone should also come with a battery optimizer deeper than just limiting charging to 80 percent.