Today.......i flew 3 flight batteries and the RC was near fully charged (one led off)....when i got the last flight in...the RC unit had Only one led lite.....its been on the charge right now Off a USB port on my computer and after near 4 hours the red lights Not Off yet.....does a low charged RC take that long to charge up ?...its a month old....and it's been recharged 5 times now.....Thanks To all who Help me understand this.