Did you try unplug battery and plug back in,you can get battery replacement which some do,if they go very dead it's what most do,,they bit like phantom drone battery,if go below that voltage the charger wont charge them back up,great pain I know,,I hardly fly my p3 lately but always recharge when down couple of lights,,found this out when I never charge p4 battery,falls below 2 volts its had it,,$$320 down the sink,,,remote replacement battery around $$80 to 90 and is larger than original but fits in the compartment...