I have a mavic Platinum that I haven't used in probably 5 years. One battery seems to have some charge in it. When I put it on the drone, and tried to turn it on, a red light temporarily came on in the back of the drone, but then when off. The other battery shows no sign of life at all. I try to charge it but nothing. The first battery blinks 1 light for a while but then stops. I also can't charge the remotes because they take a full sized usb connector on each side, which nobody uses anymore and I can't find one at home.