Try cleaning battery contacts with a pencil rubber. It worked out for me
I'm not sure of any solutions, but I am having the exact same problem with my phone.. i was on the phone with a friend and after i hung up about 20 minutes later i looked at my phone and it would only turn on if it was plugged in saying invalid battery.
My experiences with that problem is that u need a new battery. Try and purchase a new one and see if that solves u r problem. did u try u r daughter's battery in u r phone ? Maybe u should...If the problem persist it's possible that u r phone might be faulty.
In my experiences invalid battery usually means that the phone is liquid damaged. You will need to get a new phone.
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My motorola v3 razr says "invalid battery" whenever i plug it i, and that is the only time it will work. I got a new battery and it still said the same thing. the people at motorola said that moisture was in the phone because the dot on the back was red. i asked some of my friends if the dot on theirs was red and they all said yes and their phone works fine. After about a week or two, it will finally say "charging" but it will only charge half-way and once it dies, or i turn it off, it will go back to saying "invalid battery." Any help please?
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