The epoch battery pack is a 120mah pack and the transformer for the charger charges the cells at around 750ma and shuts off at 180 seconds (3 minutes). Doing the math using

Charge Current( in milliamps) X Charge Time (in hours) =capacity in mAh

gives only 37.5mah

So why is the charger cutting off after only charging about 1/3rd of the packs capacity? Granted unless the car is completely discharged you won't have 120mah to charge but I would think that after running to the point where there isn't enough torque to give any forward movement you would have used more than just 1/3rd of the capacity.

Any ideas?