I have a Phantom 3 Standard and haven't flown her for 3-4 months..I have 2 OEM Batteries and one battery when I press the button it flashes one Green light 4 times Slow..The other battery when the button is pressed it flashes Green 6 times Fast.Can someone tell me what these different Flashes mean.One Slow 4 x and the other 6 x Fast.The last time both batteries were used was 4 months ago.Is there any maintenance you are suppose to do to them when not flying.Like charge them up once in a while or is it better for them to be left discharged when in storage for the winter..