I typically bring my P2 in to land at around 30% of battery remaining just to be safe. The other day it started to lose vertical lift at around 35% just as I was bringing it in to land. Today it happened at 42%. The actual flight time was just over ten minutes with moderate flying. I have a go pro, mini IOSD, AVL58 on board. Is this a case of the data readout on the real battery level being incorrect? Or is something else going on?