Cell number 2 is 75 mV higher than the other 2 when the battery is fully charged. When it has dropped down to about 88% they are all equal and then number 2 starts speeding up discharging and when the battery has reached 50% it is 200 mV lower then the other cells and the total voltage is around 11150 mV. I know my battery is rusted but is that normal that the bad cell get higher voltage when you charge the battery? From 40 % (when the voltage goes beneath 11100 mV) it only takes 1 minute to drop down to 10 % and the P2 is only connected to my Imac, nothing else is on. If I go flying with my P2 with fully charged battery, it takes 3-4 minutes before I have to land it.