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Living way out in the suburbs, I need more range to get anywhere fun in this town. I decided to chuck the little 8.8 ah bottle battery, and install a triangle battery, and while I'm at it, why not over volt it to 48v? You can find these triangles in different ah ratings. 20 ah would probably be more than enough for most people, but I opted for the 30 ah 48v. Physical size is exactly the same whether 20, 25, or 30 ah. Right off the bat, your biggest obstacle is relocating the controller, which will be in the way. I decided to mount mine on the seat post tube, between the seat post and the tire. A good alternative position would be on the front down tube. In either position you should be able to mount the stock controller without cutting any wires. I used some left over mounts from a china girl motor bicycle kit to mount my controller. Next you'll need to fabricate a support to hold the battery weight off of the plastic box. This was pretty easy compared to mounting the controller. I used a piece of aluminum raw stock, a couple of washers used as spacers to lift the support to the proper height, and a couple button head bolts to hold it to the down tube, same as the stock battery cradle.