BATTERY BACKUP KIT, QTY. 2
041B0591 is a Battery Backup Replacement Kit. For use with various Garage Door Openers featuring a Battery Backup System (BBU). Complete kit includes: (2) 12V, 4.5AH Rechargeable Batteries. A fully charged battery backup system supplies 24 VDC to the motor unit for one to two days of normal operation during an electrical power outage. Allow replacement batteries to fully charge before using the BBU system. Check the owner's manual or replacement parts diagram for specific part information before ordering to ensure compatibility.
Replacement battery kit is compatible with the following models: LiftMaster® Model 8500 and Chamberlain® Models WD952KD, WD952LD, and HD800D