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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.
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It's the OnePlus Nord N200. It was actually released in 2021, but I purchased it new in 2023, since I could get Lineage OS on it.
So it's decidedly mid-range, but it gets the job done.
I would personally rather not spend two or three Monero on a phone if I can avoid it.