If your door keypad battery dies, which powers wireless keypad mounted outside garage that allows PIN entry, several consequences occur that prevent keypad from operating until battery replaced. When battery dies, keypad lights will dim or not light at all when buttons pressed, and entering correct PIN will not open garage door, as keypad has no power to transmit radio signal to opener, so door remains closed and you cannot enter via keypad. You will need alternative entry like garage door remote, wall button inside garage, side door, or house entry, as keypad is inoperable. Battery dying is gradual, so you may notice reduced range where you need to be closer to garage for keypad to work, needing to press buttons multiple times, or lights dimming, indicating battery low before complete failure. No damage occurs to opener or keypad electronics when battery dies, as it simply loses power, and replacing battery with same type, typically 9-volt, AAA, or coin cell costing 3 to 10 dollars, restores function without reprogramming in most cases, though some models may require reprogramming by pressing Learn button on opener and entering PIN after battery change if memory lost. To avoid being locked out, replace battery every 1 to 3 years proactively and keep spare battery in car or house. If keypad is hardwired, no battery to die, as it is powered by opener. Keeping gutters above garage clean prevents water damage to keypad that could cause battery corrosion and premature failure.
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