5 - 30 minutos
iPhone kept shutting off, would not hard reset, and constantly gave the charge battery symbol. When plugged in, it wouldn't charge. It would only work in 80+ degree F weather so this implied a battery issue. Any temperature lower, it would just shut off and give the charge battery symbol when I tried to hard reset.
Really easy fix. Not bad at all.
I had a lot of trouble finding someone with the same problem as myself. I searched and searched and couldn't find anyone. If you try to restore your phone, make sure that it has been backed-up to your computer. I lost a lot of stuff trying to restore it which wasn't necessary.