To change batteries in garage door keypad that is wireless and battery powered and mounts outside garage, you need to open keypad case, replace old battery with new same type, and ensure correct polarity to restore function. First, locate battery compartment, which is typically behind keypad cover that slides up or down, or behind cover removed with small Phillips screw at bottom of keypad, depending on model like LiftMaster 877MAX or Chamberlain KLIK2U. Slide cover off or remove screw and pull cover off to reveal battery. For 9-volt battery, pull old battery out and disconnect snap connector, then connect new 9-volt alkaline battery and place inside compartment. For AAA batteries, remove old AAA batteries and insert new AAA batteries matching positive and negative markings. For coin cell CR2032, slide old coin cell out and insert new coin cell with positive side facing up. Ensure battery type same as original, as specified in manual. After inserting new battery, replace cover and slide or screw back on. Test keypad by entering PIN and pressing Enter to open garage door; if door doesn't open, you may need to reprogram keypad by pressing Learn button on opener motor unit and entering PIN on keypad within 30 seconds to resync. Battery replacement takes minute and costs 3 to 10 dollars. Dispose old battery properly. Keep spare battery to avoid being locked out when battery dies suddenly, as dead battery is most common cause of keypad failure.
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