Why is my iPhone battery not charging?
So i have a problem with mine iPhone 4s. It stopped working and i tried to restore it with use of iTunes. After some minutes i get the error code 21. I ordered a new battery and replaced it with the old one. I pluged the phone back into the laptop and after some minutes it was working again,, YEAHH! But the only problem that occured was that the battery only charged till 92% no matter whatIi tried, different chargers(cables). So I read only that I should calibrate the battery, by draining it completely empty and then recharge it to 100%. But after draining it empty, it will not charge up anymore.. I connected it again with iTunes but get the same error as before code 21
So please help me? What can I do? And more important what is wrong with my phone?
Thanks in advance.
(some extra info: I tried restoring him in restore mode as well as in DFU mode, problem is that sometimes the phone gets into boot loop)
Is this a good question?