On Sunday my buddy destroyed his plane and we later discovered that the battery was at fault. It was a 4.8V NiMH 750 mil-amp battery, which has just been charged at 800 mil-amps for one hour. He did not monitor the charger, but it seemed to be charging when he plugged it in and was in trickle mode when he returned an hour later. It flew the plane for about 5-minutes then the plane stopped responding to controls and crashed.

After the crash the battery registered over 4V on a volt meter, but when we plugged it into another airplane we realized the battery only had enough power to move the servos a couple seconds until its power was exhausted and they would no longer move. We did not try testing it in the crashed plane because the rx was damaged in the crash.

Any thoughts what the problem with this battery was and what we should do to avoid this problem?