485LM Liftmaster OEM Battery Backup.
- ****THIS IS A LIFTMASTER BATTERY NOT A GENERIC REPLACEMENT****.
- MODEL 485LM EverCharge Integrated Standby Power System For use exclusively with the LiftMaster garage door operators (3850/8550).
- Operates the garage door opener as if the power was still on (all safety and security features still operate).
- Standby Power System and opener are one logic board, resulting in better performance in Standby Power mode Improved Battery Recovery System..