Yesterday was a fantastic day to try out my newly purchased Phantom 4 and Inspire 1 Pro from back in March (yeah for price drop) After flying for part of the fantastic afternoon, with both units and a few recharges, at 6:40PM EST, I was over 1000ft in altitude, and 6000ft in distance away from my home point when I began getting a "battery overheating malfunction" error at 58% discharge . I was over a heavily wooded area on the shores of the Ottawa River, and started to immediately come back to the home point, I had no opportunity to land, there was simply no where to land. I slowed the Inspire 1 down as much as I could but around 3210ft away at 941ft altitude (still in a heavily wooded area) there was a complete failure on the battery, and the Inspire fell, the last thing I saw was a image from the gimball rotating, and the blades still going and it looked to be branches in its view. Battery was 97% charged on takeoff- a TB48- flew longer router earlier in the day. No indication at anytime prior to battery failure.... Is this just a freak thing? BTW, I've started the process with DJI, but I'm sure they are not going to cover the Olympus 12MM lens and filter I had on the X5... Went back in the morning to with better light to see if I could find anything, within 50ft of the last contact point, I found debris. The Inspire is a total loss, The camera is no where to be found, the gimball is in piecies. It was a miracle I found anything, it's literally in a swamp.