Liftmaster 485LM Compatible Replacement Battery for Liftmaster 3850 Opener exclusively by UPSBatterCenter Liftmaster 3850 Garage Door Opener 485LM Standby Replacement Battery - 100% Compatible Brand New, Fresh Stock - Manufactured exclusively by UPSBatteryCenter Arrives fully charged and ready for use Manufactured & sold exclusively by UPSBatteryCenter 1 Year Replacement Warranty Included