Hopefully someone can offer a suggestion that will keep me from having to send my controller in for repair. I have a controller that is my secondary controller when I have two operators. As of just a few days ago, all was well. Yesterday, I tried to power it up and it doesn't appear to work. IF I plug in a charger to it, it gives me an initial indicator of 4 white lights but then doesn't go into charge mode. I thought that perhaps the battery had just gotten depleted so I left it on the charger to see if things might rectify themselves. After 12 hours, the behavior is the same. IF I try to turn on the remote while connected to the charger, it works perfectly including being able to link to my master controller and control all the gimbal functions but as soon as I pull the charger plug out of the controller, it appears to be dead. I'm guessing the battery has failed but I thought I'd put this out there in case anybody had a fix to try. Thanks!