I could only get 4 15 minute flights before the battery dropped below 4.8 volts. I have tried no less than 6 packs ranging from 1000 mah to the current pack of 2500 mah....I even tried a 6 vold pack just to see. No different. 4 flights and it's in the no fly zone
The ignition may be OK. It is possible that it is in a place where it can get too hot to operate relaible. The initial failure to operate past 4 flights seems to point in that direction.