LiftMaster makes more than a dozen residential garage door openers across the Elite, Premium and Contractor series, and these devices all differ in terms of bells and whistles. While some LiftMaster openers feature smartphone
LiftMaster remotes in the Security+ series, including the 371LM or 373LM, use 3-volt 2016 or 2032 lithium coin-cell batteries. Three-button remotes in the 800 series, including the 891LM, 893 LM, 890MAX, 893MAX and 895MAX, also use this type of battery. If you have a wall-mounted wireless keyless entry such as a LiftMaster 877LM, you need a single 9-volt battery.
If you're unsure of what type of lithium battery you need, take a close look at the old battery -- its type is engraved on the front.
Accessing the Battery Compartment
For all LiftMaster remotes, the battery compartment is on the underside of the unit. If you don't see any screws on the remote, pry off the top using the remote's removable visor clip or a flat-head screwdriver. Wireless keyless entry systems have slide-off doors on the battery compartments. Other compartments feature two small screws, which you can loosen with a Phillips-head screwdriver.
Replacing the batteries is as simple as popping the old one(s) out and putting new ones in. When inserting coin-cell batteries, always place them positive-side up. There is a plus sign on one side of the battery to indicate its positive side.
More to Know
Some of LiftMaster's remotes feature LED proximity lighting, causing them to flash when sensing movement. These require one or two additional 3-volt 2016 or 2450 batteries, labeled as "Proximity Battery" in the remote's battery compartment. On some models, the LEDs stop flashing when the battery is low.
If the proximity lighting feature is activated 10 consecutive times but no button is pressed on your remote, the feature automatically is disabled to conserve battery life. To reactivate it, press any button on the remote.
LiftMaster estimates fresh batteries will keep the opener working for about three to five years, depending on the specific model. If swapping out the battery doesn't bring the garage-door-opener remote back to life, contact the company's customer service department via email or phone.