Wheelchair Powerpack DuoTGA Wheelchair Powerpack Duo fits to a transit wheelchair in seconds. Make wheelchair pushing a thing of the past with this great little wheelchair power add on. Use a thumb to easily control the Powerpack Duo. Walk behind the wheelchair as normal, but instead of pushing, let the 12v 160w motor take the strain. Though small and easy to manage, the Powerpack Duo can propel a rider for up to 10 miles on a single charge (depending on terrain and relief),