lipo trouble

[Romelio]

ok this isnt about semis but i have a crawler that runs lipos ive never used lipo but it doesnt seem too bad. but im having a problem. the truck can only take a 2 cell lipo (7.4v) which i have. but when i run the truck it only runs for about 2-3 mins and shuts down. it seems like a voltage cut out which should be 6v.. but when i connected the battery back up to my charger it displayed that the battery still had plenty of power left in both cells. i dont know whats up. im not sure if there is a way to change the voltage cut off or what.. but its not too fun only being able to run my truck for 2 mins... the kit is the night crawler RTR and the charger is multipro intelligent balance charger. the battery came free with the kit. thanks for your helps!

truck-http://www.horizonhobby.com/Products...rodID=LOSB0104
charger-http://www.horizonhobby.com/Products...rodID=LOSB9602
battery-http://www.horizonhobby.com/Products...rodID=LOSB9830

Brian