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.
Well, you can’t prevent that entirely, it’s a chemistry thing.
But you can change how android connects, and/or use a cable that doesn’t charge but only does data. You used to be able to find such cables anyway, I haven’t looked in a while. I’m fairly sure that you could modify a cable if you’re already capable of app testing.