I can never find a good place to store the battery extender. It normally rolls out of place or takes up more space than I want it to. I cut a 3.5 inch PVC pipe to fit and used a cut piece for the bottom to keep it from sliding through. If you never (or even if you did) cut PVC pipe before with a power tool I would stress using a non electric tool. I know this is an electric bike forum. Cutting plastic and wood are completely different materials. Wood is forgiving, plastic isn't.