LIFTMASTER Garage Door Openers 475LM EverCharge Battery Backup System
For use with the LiftMaster 3800 Jackshaft Garage Door Opener and Estate Series Models 2500, 2500B, 2500D & 3500. Always charged and ready, the EverChargeTM powers the garage door opener to open and close the garage door up to 20 full cycles when the pow