Logitech MX Master Battery Replacement

Written By: Clay Eickemeyer

Comments: 3

Difficulty

Moderate

Steps

Time Required

30 - 45 minutes

Introduction

Use this guide to replace the battery in your Logitech MX Master mouse.

Lithium-ion batteries have a limited lifespan. If your mouse dies quickly, it may be time to replace the battery.

If possible, follow this guide after your battery has fallen below 25% charge. While your MX Master has a relatively small battery, any charged battery is a potential safety hazard if accidentally bent or punctured.

Tools

Parts

Step 1

Flip the mouse's power switch into the OFF position, unplug any cables, and flip it over so the feet are facing up.
The unique shape of some mice can prevent them from laying flat. If you need to, lay your mouse on a soft towel to prevent wobble.
If you're planning to reuse your existing mouse feet, note that the adhesive needs to be thoroughly heated for them to be cleanly removed.
Apply a heated iOpener to the left and right mouse feet for about one minute each.
Alternatively, you can use a hair dryer to soften the mouse feet adhesive.
When using a hair dryer, don't heat the feet for more than a couple seconds at a time—anything hotter than just warm to the touch risks melting or warping the plastic lower case.
The information sticker adhesive may soften during this step, but you don't need to remove it.

Step 2

Insert an opening pick between the left foot and the lower case.
Go slowly, and make sure the pick slides underneath both the foot and its adhesive pad. These layers separate easily.
If you plan on reusing your mouse feet, be careful not to crease them or separate them from their adhesive pads.
Slide your pick under the foot to separate its adhesive until you can grab it with your fingers.

Step 3

Peel up and remove the left mouse foot.

Step 4

Insert and slide your opening pick under the right foot to separate its adhesive.
Remove the right mouse foot.

Step 5

For installing new mouse feet or reusing your old ones:
Use a pair of tweezers or a spudger to remove any large chunks of leftover adhesive.
Thoroughly clean the bottom of the mouse with isopropyl alcohol and a lint-free of microfiber cloth. Allow the surface to dry completely.
Peel your new mouse feet away from their adhesive liners and press them firmly into place.

Step 6

Use a Phillips screwdriver to remove the four 6 mm‑long screws securing the lower half of the lower case.
Use a T5 Torx driver to remove the two 4.3 mm‑long screws securing the upper half of the lower case.

Step 7

Insert your opening pick into the seam between the thumb rest and the lower case.
Pry your pick upwards and pull the upper shell away from the lower case with your free hand until you see the gesture button clip release.

Step 8

Insert your opening pick between the rear of the upper shell and the lower case.
Slide your pick right, away from the thumb rest and pry upwards to release the two clips securing the rear of the upper shell.
Don't try to fully remove the top shell just yet—a cable connects the upper shell to the lower case.

Step 9

Be careful not to strain the cable connecting the upper shell to the lower case.
Lift the upper shell away from the lower case and lay it on the thumb rest side.
To reinstall the upper shell, insert the gesture button clip first, then press down around the perimeter of the upper shell to engage the remaining clips.

Step 10

Use the point of a spudger to flip up the white locking flap on the interconnect cable's ZIF connector.
Pull the cable straight out of its socket.
During reassembly, insert the cable with its blue tab facing up, then flip down the locking flap. The black line will align with the socket's edge when the cable is fully inserted.

Step 11

Remove the upper shell from the lower case.

Step 12

For easy access to the battery connector, it's helpful to first move the battery and its housing out of the way.
Use your Phillips screwdriver to remove the three 6 mm-long screws securing the battery housing to the lower case.

Step 13

Don't yank or strain the battery cable.
Lift the battery housing up and lay it over the rear edge of the lower case.

Step 14

Use a pair of tweezers or your fingers to grip the top of the battery connector.
Always pull cables by their connectors and not the wires themselves.
Gently rock the connector side to side and pull it out of its socket.
The connector is held tightly within its socket. If it feels stuck, try a different grip—use the protrusions around the neck of the connector if you need more leverage.

Step 15

The battery is secured within its housing by some light adhesive.
Flip the battery housing over so the battery is facing down.
Apply a heated iOpener to the battery housing for about 2 minutes to soften the battery adhesive.

Step 16

Try not to bend, crease, deform, poke, or puncture the battery with your tool—a damaged battery is a potential fire hazard.
Insert your opening pick between the long edge of the battery and its housing, opposite the cable.
Slide your pick under the battery to slice the adhesive.
Pull up to peel the battery away from the adhesive.

Step 17

Remove the battery.
To install a new battery:
Use a spudger or your fingers to peel any old adhesive off of the battery housing. The old adhesive shouldn't leave any residue.
If your new battery doesn't come with preinstalled adhesive, place a couple strips of double-sided tape into the battery housing.
Orient your new battery so its cables route through the cutout in the corner of the housing. Press the battery firmly into place to secure it.

Conclusion

Compare your new replacement part to the original part—you may need to transfer remaining components or remove adhesive backings from the new part before you install it.

To reassemble your device, follow these instructions in reverse order.

For optimal performance, calibrate your newly installed battery after completing this guide.

Take your e-waste to an R2 or e-Stewards certified recycler.

Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.

Author

Clay Eickemeyer

Member since: 19/09/22

65190 Reputation

3 comments

Thank you so much for this guide! My MX Master’s battery life has been slowly dwindling. I made the mistake of not verifying my original battery’s dimensions, roughly 1” x 1.25”, about a third of the size of the replacement I ordered. Was still able to swap batteries (from 500mah to 1150mah) by swapping connectors and removing the battery holder compartment. The new battery’s size is sufficient to avoid movement, but used a drop of adhesive just in case.

DefaultHuman -

Does anyone know where to find the correct size replacement battery? Thanks

Josh Hixson -

I used a larger Lipo battery of the same voltage, and soldered the cables from the original... upgrade!

Glyn Griffiths -