When it's all itemized a Brammo or a Zero starts sounding reasonable. Mine's a toy because of the lack of strong enough 3-5 speed hubs, I used a geared hub with 3000W, and that was really pushing its limits. To me its definitely not worth the $1500 pack of lithium cells to match the performance of the lead on the bike now that is limited in range. The argument that you're paying for the gasoline upfront only works out if your ride all the time, and the pack doesn't die prematurely because of an accident or quality failure. Basically for Li, you get 2-3x the power density of SLA but it costs 5-10x more. The current demands of a big motor mean you need a ton of cells in parallel to be able to meet the demands without frying the batteries. In my case, 66V, 100A Peak, meaning a theoretical 8-9 hp would require $1500 in cells alone, plus a controller, BMS, alarms, charger, tons of HD copper wire, plated fittings...
Good luck, and as always, post pics! Words are cheap, pictures are expensive, lol. If I were you I'd look on CL for a used electric scooter and just run it, they're a good value if you can get over the fat chick quotient.
