iPhone 6s turning off at 10-20%


for last couple of days iphone 6s has been shutting off @ high percentages (14% yesterday, 18% today). when try turn on, give me low battery symbol, other times turn on. however, if does, shuts off again quickly.

before started happening, suspected might wrong battery because average 6 hours of battery life normal usage, while lot of people on forum seem getting 7-8 hours. additionally, i've had weird problems charging. phone seem charging slowly, reset phone , when turned on, @ higher percentage before (around 10% more). there doesn't seem major problem discharging rate though.

bit of background in case might relevant: when first got 6s, restored backup of old iphone, encountering bug siri restored new. restore, mentioned before, battery life has been suspect. guys think have problem battery, or should restore new again? i'm reluctant because have saved game data don't want lose, if firmware glitch, i'll have it.
 

exact same problem here. phone shutting down @ 18%. tried restoring, adding apps 1 one. didn't matter. apple replaced phone. day later, same thing. time able video happening. brought new phone back, showed video, , gave me new one. third 1 perfect. no issues. 3 phones 128 gb. 3 running 9.2.1. first 2 had samsung a9 chips. third 1 has tsmc a9 chip. don't know if mattered.

 


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