Origineel bericht door: Minho ,
I wonder how good some of these replacement batteries really are. With the high worldwide demand in 6S batteries, Apple is taking all of the good stuff and what's left might not be so good. Heck, even Apple has struggled with batteries. Batteries performing poorly when at 20-30% of charge is a classic case of dead or dying batteries. I would talk to your supplier about this as it may be more indicative of poor batteries than an iOS issue.