Yes, most garage door keypads that mount outside garage and allow PIN entry to open door without remote take batteries, as they are wireless and battery powered for easy installation without running wires, though some older keypads may be hardwired and not need battery. Modern keypads like LiftMaster 877MAX, Chamberlain KLIK2U, and Genie wireless keypads use battery to power electronics, backlight, and radio transmitter that sends rolling code signal to opener, typically using one 9-volt battery, one or two AAA batteries, or one coin cell CR2032 depending on model and brand, which lasts 1 to 3 years with average use of 2 to 4 entries per day. Battery is located inside keypad behind cover that slides off or is removed with small screw, and when battery dies, keypad lights dim or don't light, and door won't open with correct PIN, indicating need for battery replacement costing 3 to 10 dollars with same type and correct polarity. Some newer keypads use lithium battery that lasts longer, up to 5 years. Wired keypads that are hardwired to opener via low-voltage bell wire do not take batteries, as they are powered by opener transformer, but these are less common today as wireless is preferred for easy installation. If your keypad stops working, first replace battery, then reprogram by pressing Learn button on opener and entering PIN on keypad and pressing Enter within 30 seconds to resync. Keeping spare battery avoids being locked out.
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