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 doesn't mean it's still in good enough condition, Some of the cells in the battery can die off thus seriously reducing the charging power which is why my old phone wasn't able to stay on the home page long enough for me to make calls or use the Net.
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