For what it's worth, this is the best li-po battery use page on the net that I know of:

http://www.batteryuniversity.com/parttwo-34.htm

Eg "Batteries with fuel gauge should be calibrated by applying a deliberate full discharge once every 30 charges. Running the pack down in the equipment does this. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely."