Any Way To Confirm If My Daughter's iPhone Needs A New Battery Before I Buy One?

Soldato
Joined
12 Mar 2005
Posts
4,327
For a couple of days my daughter's 6s has been stuck in a restart loop.

It tries to boot up, gets to the white screen with the apple logo, screen goes black and then it cuts off to try again. I can't restore it either normally or by DFU and am getting the old iTunes error 21. I've also tried all combinations of home button/power button/volume button but no joy.

She mentioned it wasn't charging properly a few weeks back but when I tried it with a different cable it seemed to be fine so I thought it was something she was doing. Now I'm thinking that the phone is trying to power on but can't draw enough power from the battery as it's loading the OS and that's causing it to cut out.

As I type this I'm convincing myself it's the battery but is there any way to test it before I spend £20 on the kit?

I suspect not but just thought I'd ask.
 
Soldato
Joined
24 Jun 2008
Posts
8,328
If the phone is apple logo boot looping, and gives an unknown error when trying to restore, it’s more likely to be a failed Tristar/ PWMC rather then battery. The fact it wasn’t charging properly is the giveaway symptom
 
Soldato
OP
Joined
12 Mar 2005
Posts
4,327
If the phone is apple logo boot looping, and gives an unknown error when trying to restore, it’s more likely to be a failed Tristar/ PWMC rather then battery. The fact it wasn’t charging properly is the giveaway symptom
Would a faulty tristar still allow it to take some charge when plugged in e.g. If the battery is completely dead and I plug the charger in for half an hour, it starts trying to turn on again and once the charger is removed its keeps going until the battery goes flat again?
 
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