So I haven't flown my bird for a couple months. The other day I pulled it out to charge the batteries and update all the firmware. Bird did just fine. As I went to charge up the RC, it was dead. No beeps, no lights to show you the current charge. I plugged it in to the charger and it acts like it has a full charge. I figured it auto drained and just needed a few hours on the charger. Pulled it off after 3 hours and nothing. Dead as a door nail. Help me!!