Since repairing the screen, I have noticed that the battery temperature sometimes registers as -30.0 deg C. This causes the phone to not charge and also will not boot up. I found that a good old knock against the back cover sometimes fixes the problem temporarily, but it's far from ideal.

I would like to know where the battery temperature sensor is located, to know what i have to replace (I'm expecting this to be built into the battery but I'd rather confirm first)