To replace battery in your garage door keypad that mounts outside garage and allows PIN entry, you need to open keypad case, remove old battery, and install new battery with correct type and polarity. First, locate keypad outside garage, usually mounted near garage door frame. Slide cover up or down to reveal screws or battery compartment, as most LiftMaster 877MAX keypads have cover that slides off or is removed by unscrewing small screw at bottom using Phillips screwdriver. Open battery compartment and note battery type, which is typically one 9-volt battery, one AAA battery, or one coin cell CR2032 depending on model, as indicated inside compartment. Remove old battery, noting orientation of positive and negative terminals. Insert new battery of same type, ensuring correct polarity matching markings inside compartment, as reversed battery prevents operation. Close battery compartment and slide cover back on, securing screw if present. Test keypad by entering existing PIN and pressing Enter to see if door opens; if door doesn't open, you may need to reprogram keypad by pressing Learn button on opener motor unit and entering PIN within 30 seconds. Battery cost is 3 to 10 dollars at hardware store. Replace battery every 1 to 3 years or when keypad lights dim, range decreases, or you need to press buttons multiple times. Keeping spare battery avoids being locked out when battery dies suddenly.
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