I've been making custom parts for the defunct Boosted Rev for some time now. One part that I continuously get questions about is the battery. Considering many people end up with dead batteries, I put together two 3d-printable designs that allow for people to put together their own batteries with minimal effort. I made 2 designs: 370Wh battery, 12S3P 18650 cells. Original capacity, small size. Extra space for large/smart BMS. 1000Wh battery, 12S5P 21700 cells. Huge capacity but very large. Requires a small BMS to fit the VESC. 1kWh extended battery, packaged and ready Both designs are best printed in a water resistant, flexibel material, like PETG or ABS. If you wrap up the battery correctly in shrink wrap, the battery may be rendered waterproof using extra silicone or waterproofing tape. Needed: PETG, ABS or other watertight, flexible filament (it's important the filament is flexible, don't print in hard resin) 180mm or 200mm battery shrink wrap (available on Amazon or