The Pioneer 3 is powered by 1 to 3 lead-acid wet cell batteries. These provide a nominal 21AHr of energy, and under normal use should provide power for Selene well over the 2 hour time limit for the challenge.
However, they are particularly large and heavy. So thanks to the guys at Lincad, we now have a Li-Ion battery pack roughly half the volume (casing aside) and less than half the weight while retaining the same 21AHr capacity of the originals!
The new battery provides a number of benefits, the most significant of which is the more convenient shape. The new battery sits in the belly of our chassis, lowering the center of gravity and providing easy access through the bottom of the rover. The smaller size leaves room for the additional flipper control mechanisms inside the chassis.