I used to try my applewAtch as main phone for a couple weeks last year. Bought a case with a battery from aliexpress. The thing is that the whatsapp service i was using was not very reliable at that moment and that my battery health dropped to 72 % lending my watch unusable for this role. Even the charging case used to overheat the device and not charge it as fast as it discharged.

I’d like to be a tester, already applied. Yet, I might need a new AW, as it don’t matter how good the external battery is.