I know this posting query is old, but nonetheless my experiences might be useful to somebody, I've got an LG G3 phone bought new 6 or 7 years ago. It suddenly started flipping back to the Logo screen about 3 weeks ago and blinking non-stop. The Green light kept fading until no more. Occasionally, it would reach the homepage only to flip again after a minute or two. Looked up the Internet to get some info on the prob, but most said it was probably the motherboard. Just today, I threw it in my shopper to take to a recycling centre and decided to give it one last try. The battery still had sufficient juice to boot it up and reached the home page but only for a minute then it flipped as usual. It then dawned on me it could actually be the battery at fault and remembered I still had a spare somewhere in the house bought at the same time, What do you know, I put it on charge and then switched the phone back on. It works like new again. It thus appears that although a battery might be charging to 100%, that...