iPhone 6s not charging with drained battery
The phone won’t charge/boot up with an empty battery. If I install a battery with a charge the phone boots up and charges just fine.
At first I thought the battery might be faulty, so I bought a new one. After installing, charging it up to 100% and then draining it completely until the phone shuts down, I get the same result. The phone refuses to charge/show the red battery icon on screen. Put another test battery in it (charged using a spare 6S) and the phone boots up / charges just fine…
Any thoughts?