I have a < 2 year old Motorola MotoG3 smartphone. The instructions say: "Motorola batteries and charging systems have circuitry that protects the battery from damage from overcharging." So recently I did not worry about leaving it connected to a 5V charger for hours at a time to ensure it was always ready for use.
The first symptom was that the flash/torch LED did not light up; I wondered if, since this is software mediated, it was a fault in the Marshmallow upgrade at about the same time.
Then recently the screen has popped out of the housing, leading me to suspect that the battery was not protected as specified and has bulged badly. Discussion with Motorola support led only to the offer of a charged repair, though I argued that this counts as "unfit for purpose" under UK law.
So I have a replacement battery on order and have removed the old one which has indeed bulged. It may even have bent the motherboard which is reflective enough to show a convex mirror effect. Also the connection between the motherboard and the flash/torch LED is just by spring contacts next to the battery, so a bulging battery has probably caused a disconnection. Thus the failure of the flash/torch LED could have been diagnosed, by anyone who knows how the phone is designed, to be caused by incipient battery bulge long before it got to the point of screen ejection.
Any comments?
Mike.