what's a reliable way to determine my device's battery health? something like Coconutbattery for macOS - charge cycles, health, factory/remaining mAh, etc...
tried CPU-Z, says health is "Good". gee, thanks... out of what, "Excellent" through "Shit" or what?
backstory, I got a Samsung Tab S6 used, wiped it and installed LineageOS 20 and I'm using for a couple of months. the battery kinda sucks. granted, I have like 3-4 hours SOT/day but a 7000 mAh battery should last a couple of days; pure guesstimation, I had an iPad some years ago and that thing lasted for eons.
if I leave it overnight with 10ish% battery remaining and battery saver on, it's dead by morning. that sort of drain can't be normal? on the other hand, I don't have google services so every app has its own running service - syncthing, KDE Connect, Allcast, Jellyfin Player, etc.
there's the stuff I can read from /sys/class/power_supply/battery/ but nothing useful in there; like charge_full and charge_full_design are the same (70400) and other promising sounding items are unset or nonsensical.
tried the same on my Redmi phone w/LOS, completely different files there and equally useless.
I don't wanna go through sourcing the battery, prying the thing open and replacing it, only to find out that's how it's supposed to work. any ideas?
It can do a health check, just requires 1 or 2 full discharge/recharge cycles.
It measures current consumed during the charges and compares that to the battery specs.
Over the years I've found it pretty accurate. I keep multiple phones of the same type with the exact same OS/app build out, and can see the difference in battery health between old/new, and see it reflected in battery life when using either one.
I keep phones forever, and run AB on them once or twice a year, and it consistently shows their health dropping. I lose about 7-10% health per year, and that's reflected in reduced battery life during a day.
One phone is down to about 40%, and even with Lineage you can tell. It can run for a couple hours before needing a charge, while the 83% health phone goes most of a day. Again, same hardware, same OS, same apps, same usage.