It might be the chip that is out of calibration. The battery will be charged but the phone not showing it. You should run the battery down until it turns off by itself, then with phone still off recharge fully using a wall charger. When the battery is fully charged take the battery out for about 5 mins. Then replace it and turn on. This should reset the chip so it knows where full and empty is on the battery.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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