I havent had to switch batteries in flight lately but my power flarm will reset and start a new log it interupted in flight. Very annoying as I use it almost exclusively for logging as its download is very fast and simple. My backup logger is the venerable SN10B, it does not reset and continues right where it left off, Thanks YO! I have thought about adding a cap to the circuit for the powerflarm. Lots of good ideas here so far but I am trying to keep it as simple as possible.