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LiftMaster Key Fob Battery Replacement Guide
How to change a dead battery in the 890MAX key fob remote control for a Chamberlain garage door opener.

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LiftMaster 890MAX
Back Side of Fob
Right Side - Small Notch
This home maintenance tutorial was specifically written to assist owners of the 890MAX mini key fob remote control for a LiftMaster, Chamberlain, Craftsman or Sears brand garage door openers in changing a weak or dead battery.

Owners of other similar garage door opener remote control model numbers such as the G953EV-P2, KLIK3U-BK, 956EV, 953D, MC100-P2, 371LM, 953EV-P2, 373LM, 300 MC and 950CB may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery is part number CR2032.

The battery is available from various manufacturers such as Energizer, Panasonic, Duracell, Sony and Maxell.

The only tool needed to access and replace the battery is a flathead screwdriver or a similar object such as a butter knife, nail file or a small coin.


Insert Flathead Screwdriver
Pry Open Two Halves
Top Cover Removed
Insert the blade of your large flathead screwdriver into the notch on the right side of the fob.

The plastic is relatively soft, so you can expect some minor damage to occur while prying apart the two halves of the fob.

Gently twist the screwdriver to pop the top cover off the bottom of the fob's case.

Set the top cover aside in a safe place.

Pry Out Old Battery
Battery Out of Socket
Old CR 2032 3V Battery
Gently push the old battery out of the socket.

Try to avoid bending the metal electrical contacts or scratching the green circuit board.

Negative "-" Side Down

Install New Battery
New Battery Installed
Orientate the new battery with the negative "-" side facing down and the positive "+" side facing up towards you.

Carefully slide the new CR2032 battery into the holder.

Make sure the new battery is fully seated in the socket.

Line Up Two Halves
Pop Together Fob Case
LED Light - Test Fob
Line up the top cover with the bottom of the fob's case.

Gently snap together the two halves of the fob together.

Make sure that the two halves of the fob are flush together at every edge.

To test the new battery, press any of the three buttons.

If the new battery is working properly, you should see the red LED light illuminate on the bottom of the fob.

You shouldn't need to re-program the fob for your garage door opener. Just changing the battery shouldn't clear the original programming.

If you do need to re-program the fob, press the "Program" button on the control panel (such as the 888LM) or on the garage door opener itself. Then press the button on the fob that you would like to use. You should see the overhead lights flash if the programming was successful.

For more, check out all of my Home DIY Repair & Maintenance Guides.

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