I have a 2016 DJI phantom 4 drone and haven’t used it in 1-2 yrs. Decided to get it back out of the case and charge the batteries and use it to do some crop scouting but the controller will not charge up all the way. The first 2 lights will flash saying it’s charging for about 5 minutes and then all the lights will go out and that’s as far as it gets. Is my controller junk or what’s wrong with it? It’s been in the box for about 1-2 yrs and worked just fine when I put it away. Any help would be appreciated.