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Most devices try to be clever with figuring out battery charge (which is not simple).
They count the electrons going in and out.
So if you have a dead battery and it says 10% and you replace it with a fully charged battery your device will say, "Wait, it was at 10% and now the voltage is suddenly higher but I haven't seen any electrons going in. Therefore it must still be at 10%."
I've run into this problem a lot.
You can't just tell it, "Dude, it's at 4.2V, you're telling me that's 10%?"
This is my JetPack which has plenty of voltage but it's too stupid to notice.
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