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Help Battery question mark?!?!?!!?

i recently turned my phone on while it was plugged in and all i see is a battery with a giant question mark. i tried pulling the battery and i cant find a solution. can anyone help?!

Member MusicIstheKey gave you a great answer. I'd expand it just slightly to take a pencil erasure and rub it gently but firmly on the contacts of the battery itself. A bit of corrosion there will cause issues such as you describe.
 
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I joined just to say MusicIsTheKey's answer saved me from unnecessarily replacing the battery. I took an old gift card and cut a small sliver that could clean around the terminal port, and pulled up a lump of dust bunnyish stuff.

Conclusion: Dont leave your chargers on the ground, I think it started to collect, and every time I put it in my phone it just deposited all the crud. Works fine now, thanks so much dude.
 
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