Remove battery for 10 min, plug phone in charger for a second or 2 then after 10 min put battery back in see if that works, if not you may need a new battery, check battery before with a meter to see if its holding any charge, it can be the chip in the battery that tell the device what voltage is in the battery.
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Remove battery for 10 min, plug phone in charger for a second or 2 then after 10 min put battery back in see if that works, if not you may need a new battery, check battery before with a meter to see if its holding any charge, it can be the chip in the battery that tell the device what voltage is in the battery.