jason

Reconnecting the battery poorly can cause the iPhone to appear to be properly powered and functional, but then suffer a reboot loop.

I had difficulty after a screen replacement, and the Console app on my Mac showed that the ‘thermalmonitord’ process was throwing lots of errors from not getting any sensor readings from the battery. It would never charge past 1% and just kept rebooting.

The contacts on this conector looked fine so even though I had reseated this connector several times already, I reconnected it very firmly using my thumb and a spudger to really press all the corners and middle and really gave it a good massage and then finally it showed the normal dead battery screen and started properly charging and eventually booted back up to normal functionality.

It seems the battery has to be able to transmit data to the phone to say it’s not overheating or iOS will not allow any current into the battery to recharge it, and the kernel will panic from the null readings and just reboot over and over again.