When going lipo with a starter box the 'C' rating is important.
A starter box trying to turn a tight engine creates a lot of amp load on the motor and battery. The C rating of a lipo is how many amps the battery can handle without damage/heating up.
The C rating works like this:
A 2200mah lipo = 2.2 amps.
2.2 amps x 20c = 44 amps so a 2200mah 20c lipo can withstand 44 amps without voltage-sag/damage/puffing/frying.
More examples:
2200mah 40c - 2.2 x 40c = 88 amps that this battery can handle.
5000mah 20c - 5 x 20c = 100 amps that this battery can handle.
A higher C battery will provide more torque to the motor as well because there is less voltage drop as the amperage gets higher.
This rule applies to any lipo whether 3s, 4s, etc.
Get either the biggest mah or highest C you can afford. Or both.
EDIT: After reading through the Losi starter box thread, it's become evident that the motors provided are capable of withstanding only a low amperage. I don't know how many amps these motors are rated for but to be safe, I would stick with a lipo of the same or only slightly higher specs than the one Losi makes for thier box (2200mah 20c.) The higher the mah or C rating of a battery, the more amps it will feed the motor when asked (bogging, stopping on a tight pinch, etc.)
Last edited by WingWrecker; 09-17-2009 at 05:33 PM.