iPhone will not charge, power+home shows apple logo then low battery
I recently decided to fix my old iPhone 6 Plus.
After replacing the screen the phone showed the low battery symbol when I plugged it in, but that is it.
When I press the power button and the home button, I can get it to show the apple logo but after a few seconds it turns back off to the low battery symbol.
I was thinking it is a battery problem, but I just want confirmation before I buy another battery.
Thanks for your help!