You don't think flying in 20mph winds and 'imminent cold' might have something to do with the lower battery temperatures by any chance?Forgot about update until I had a $1000 paper weight! After update though everything is good, had sustained winds of about 20mph and the bird was steady. No drifting or anything and my batteries too seem to be finishing at lower temps. Prior to upgrade they were about 118-125°F range, the upgrade the temps were 104 and 106° after my flights so no issues here accept for the imminent cold and snow that will be grounding me soon.