Q: How much weight will the kit and battery pack add to my bike? A: The motor kit will add about 12 pounds by itself. Battery weight depends on your choice of battery type. A Li-Ion battery pack will weigh from 7 to 11 pounds. If you use a NiMH pack it will weigh about 10 pounds. Sealed Lead Acid batteries can weigh from 15 to 30 pounds. Additionally, you can plan on a pound or two for the rack and bag to hold the battery pack.