Do you have to use both batteries for the Packa to work?
No, the benefits of the Packa can be enjoyed with just one battery! The Packa has up to a 30 mile range with one battery equipped, with an optional second battery upgrade to increase the range of your ride. The Packa may be purchased upfront with two batteries, or you can purchase it with a single battery and upgrade to a second battery later (with separate purchase cost).