Yes, there is a battery in a garage door keypad that mounts outside garage door and allows PIN entry to open door without remote, as keypad is wireless and battery powered, not hardwired, though some older keypads may be wired. Most garage door keypads, such as LiftMaster 877MAX, Chamberlain KLIK2U, and Genie keypads, use battery to power electronics and transmit signal to opener, typically using one 9-volt battery, one AAA battery, or one coin cell CR2032 depending on model, 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 screw, and when battery dies, keypad stops working, lights may dim or not light, and door won't open with PIN, so replace battery with same type ensuring correct polarity. Some newer keypads have lithium battery that lasts longer, up to 5 years. Wired keypads that are hardwired to opener do not have battery, as they are powered by low-voltage wiring from opener, but these are less common today as most keypads are wireless for easy installation. If your keypad stops working, first replace battery, then reprogram keypad by pressing Learn button on opener and entering PIN on keypad and pressing Enter within 30 seconds. Keeping spare battery avoids being locked out, and battery cost is 3 to 10 dollars.
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