Originally Posted by
Sir Bikesalot
I'm guessing you went with RC NiMH batteries instead of Li-ion because you had them already? Myself I have a whole bunch of AA NiMH so I made a 14.4V battery out of them by gluing together two 6AA holders (<2$ each from mouser.com).
Good recommendation on the cage rocket and Maha C777 btw; I just ordered the former and am seriously considering the latter.
I found RC car batteries long ago when there weren't any good light systems...commercial or DIY. I find their size convenient, the power good, they are relatively cheap, they're rugged and they work in my RC car

Although the Li-ion would be lighter, they are too expensive and too delicate for my tastes.