The Electristar is designed for several battery options. You can use either two 7-cell NiCd/NiMH packs in series or two 2-cell LiPo packs in series or a single 4-cell LiPo pack. When using a single 4-cell LiPo pack, you need to create a shorting stub for one side of the existing dual battery connection scheme. I created one using a mating Dean's Ultra battery connector. The shorting jumper wire was then covered with black shrink wrap tubing.

I measured the current and power using two 7-cell 3000mAh packs and a single 4-cell 3200mAh (20C) LiPo pack.[ul][*] 27amps (190w * 2=380w) w/two 7-cell 3000mAh NiMH packs (30oz total)[*] 30amps (440w) w/single 4-cell 3200mAh (20C) LiPo pack (14oz)[/ul]
Note that the power level was higher using the 4-cell LiPo pack due to a slightly higher voltage output under load. Also note that the LiPo pack weighs a full pound less than the two NiMH packs! This will drastically increase your watts per pound rating.[ul][*] 380w/6lb = 63w/lb using two NiMH packs[*] 440w/5lb = 88w/lb using a single LiPo pack
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The 63w/lb power level of the two 7-cell NiMH packs should provide good trainer power with some limited aerobatic capability. The 88w/lb level using the LiPo pack will provide the ElectriStar with strong aerobatic performance. A good scenario here might be to first learn to fly the ElectricStar as a trainer using less expensive NiMH packs and then upgrade at a later time to a LiPo pack (or packs) to make the ElectriStar fly like a sport plane and push your skills to a higher level.