Phantom 3 pro controller

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Haven't used my drone in a while .The batteries charge but the controller seems not to be working. When the charger is hooked up the 4 lights seem to just blink kinda of fast . I try to turn the controller on the lights light up in a line then just go off they want stay on showing how much charge in in he controller . Thanks for any help
 
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Oh dear, care, or lack of, of LiPo batteries.
They should NEVER be left for long periods of time without intermittent discharge/charge.
From your description the RC battery is "FLAT, DEAD".
You can try charging/discharging the RC a few times which might bring life back to the battery but you may have to buy a new one.
 

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