I just checked the Duratrax site and it says you can set it to charge from .4 A to 5 A, what setting did you have it on? If it was 30 minutes to "charge" then you probably had it set to charge at 3A (NOT GOOD!).
Do you have a manual included with the charger? Set it to charge at 1.5A and it will take an hour to charge (good setting).
It also says that you can program battery charging settings into the charger for up to 5 different packs. Figure out the settings and how the charger works and save the setting, after that you can plug in your battery and "set it and forget it".
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE