I do lots of testing of apps in real phones, not emulators.
The thing is that the phones must be connected to the PC all day. Because of this, phones battery get swollen and I have to buy phones regularly.
Do you know any android phone which can be connected and on all day all week without getting swollen after a time?
Must be real phones, emulators are descarted.
Not an android user or anything, but I would assume there are apps to disable charging the battery. Or apps to allow you to use a phone without the battery.
If you can disable charging then I’d discharge to 20% or so then disable charging and connect it. 20% should be a fairly safe storage capacity for the battery. Maybe 30-40 to be on a bit safer side.
Then you could just go through a battery cycle once a month or so to ensure different cells get used. I’m sure you could figure out an automation for that mr tester man.
Any app I’ve found that can do this requires rooting. Some ROMs include this by default.