I had the same thing on the latest app and firmware version available as of the time I'm writing this. I have 3 batteries, went through the latest FW update on the whole system (I'm assuming it updates the drone, battery, and controller to be at the same level during an update). One that was completed I rebooted the drone, controller, and app. Everything seemed fine, so I **** everything off and swapped the battery in the drone and started everything up again. The 2nd battery gave me that same error. So I shut everything down and tried the 3rd battery, same error came up. Batteries 2&3 were about 60℅ charged and the first one was about 90%. I charged up one of the batteries and the message went away after the charge. Seems this issue has something to do with the charge % of the battery perhaps.... Maybe it's a warning to tell you that the battery is only half full or something. Also these batteries had been sitting around for awhile and had discharged themselves. I guess they will power themselves down after a few days because of the LiPo chemistry. Any thoughts?