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This part replaces the following legacy part #'s : 41B591, 41B0591, 9000001, 012381415915
041B0591 is a battery backup replacement kit. Compatible with various LiftMaster® garage door openers that feature a battery backup system. Complete replacement kit includes: (2) 12V, 4.5AH Batteries. Check the manual or replacement parts diagram for specific part information before ordering to ensure compatibility.
Genuine LiftMaster® replacement part.