Which one? The Mini Eco? I ran 2s 2100mAh TP Prolite in mine, it was designed for a 7 cell pack of AF-2/3A NiMh so weight is not a problem in fact with a regulation <110g LiPo like mine you will have to add some lead to the flood chamber to get it to self right. I flipped my servo round so I could get the pack further back and can not fit much more than I have back there maybe another 4mm, but there is room for a bit fatter battery in the stock location.
You should get 5-6 minutes on 2200mAh (I got 6+ in lap from 2100, but that was fully depleting the cells which I wouldn't recommend for sport running) but if you really want more runtime I would make a little balsa tray to hold a second pack horizontally over the stuffing tube as low and as far back against the servo as possible, next to the vertical one on the flood chamber wall for 2s2p 4400Mah.
Paul Upton-Taylor, Greased Weasel Racing.
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