I've seen several threads where the telemetry shows a sudden loss of power which led to crashes. It was suggested that this was due to an improperly secured battery. I do know that unless the battery is fully seated the spring loaded rear latch cannot engage. I'm curious about the front latching mechanism; the one that makes the rather loud click when engaged and the pressure of which must be overcome to release the battery. I regret not having looked into this further when, after a recent crash, I had the top and bottom covers off. I did a little Googling to try to find some info on this and came across the Typhoon H Main frame and battery compartment available for less than $20 US which included shipping. Due to the crash, one of the main frame arm mounting holes was compromised. I backed it up with a small piece of aluminum but had the damage been more severe the frame would have needed to be replace3d. Now I'll have a spare on hand and hopefully, I'll be able to see what secures the battery. Here's the ebay link: NEW Yuneec Typhoon H Main Internal Frame with battery compartment | eBay