User Friendly Adapters. Using the Freefly Movi Pro to SL Battery Adapter 2-pack, your options for fuel are pushed further than before. These adapters are insanely easy to connect, swap, and remove; made possible by its toolless, quick-release design. Two 4-pin Molex connectors provide 18 to 25.2V accessory power for these units, making it the perfect companion for your MōVi Pro system.