While flying today along side my LHS owner, and after he squared me away with the charging voltage so I had full battery charges, I noticed when I received my first low battery signal the voltage read-out on the ST16+ said 4.4 volts. Once I got the bird on the ground (It was very close to hovering eye level so it didnt take long) and checked the percentage left in the battery it was down to 10%. My LHS owner asked me if there was some way to change the warning signal voltage level as 10% is too low. I looked and could not see anything other than channel settings that are adjustable. Does anyone know if the low battery voltage warning can be set to trigger earlier? Have many people checked their battery level once it came back from low level signal and found the same issue?