Logitech MX Master 3 Battery Replacement

Introduction

Use this guide to replace the battery in your Logitech MX Master 3 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 3 has a relatively small battery, any charged battery is a potential safety hazard if accidentally bent or punctured.

What you need

Step 1 Soften the mouse feet adhesive

Logitech MX Master 3 Battery Replacement, Soften the mouse feet adhesive: step 1, image 1 of 3

Logitech MX Master 3 Battery Replacement, Soften the mouse feet adhesive: step 1, image 2 of 3

Logitech MX Master 3 Battery Replacement, Soften the mouse feet adhesive: step 1, image 3 of 3

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.
Heat an iOpener and apply it to each of the 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.

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Step 2 Separate the mouse foot adhesive

Logitech MX Master 3 Battery Replacement, Separate the mouse foot adhesive: step 2, image 1 of 3

Logitech MX Master 3 Battery Replacement, Separate the mouse foot adhesive: step 2, image 2 of 3

Logitech MX Master 3 Battery Replacement, Separate the mouse foot adhesive: step 2, image 3 of 3

Slide an opening pick under an edge of the left mouse foot.
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.
If the foot feels stuck, apply more heat before continuing.
Slide your pick under the foot to separate its adhesive until you can grab it with your fingers.
Peel up and remove the left mouse foot.

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Step 3 Remove the right and rear mouse feet

Logitech MX Master 3 Battery Replacement, Remove the right and rear mouse feet: step 3, image 1 of 2

Logitech MX Master 3 Battery Replacement, Remove the right and rear mouse feet: step 3, image 2 of 2

Repeat the previous two steps to remove the right and the rear mouse feet.

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Step 4 Reassembly information

Logitech MX Master 3 Battery Replacement, Reassembly information: step 4, image 1 of 3

Logitech MX Master 3 Battery Replacement, Reassembly information: step 4, image 2 of 3

Logitech MX Master 3 Battery Replacement, Reassembly information: step 4, image 3 of 3

If the adhesive separated from the foot:
Slide the flat end of a spudger under an edge of the adhesive. If the adhesive seems stuck, you may need to heat the adhesive further.
Use a pair of tweezers or a spudger to remove any large chunks of leftover adhesive.
For installing new mouse feet or reusing your old ones:
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.

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Step 5 Remove the case screws

Logitech MX Master 3 Battery Replacement, Remove the case screws: step 5, image 1 of 1

Use a Phillips screwdriver to remove the five 4.3 mm-long screws securing the lower half of the lower case.
Use a T5 Torx driver to remove the one 4.2 mm‑long screw securing the upper half of the lower case.

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Step 6 Release the left clips

Logitech MX Master 3 Battery Replacement, Release the left clips: step 6, image 1 of 3

Logitech MX Master 3 Battery Replacement, Release the left clips: step 6, image 2 of 3

Logitech MX Master 3 Battery Replacement, Release the left clips: step 6, image 3 of 3

Insert your opening pick into the seam between the thumb rest and the lower case.
Slide your pick right, towards the rear of the upper shell and pry upward to release the left clips.

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Step 7 Release the right clips

Logitech MX Master 3 Battery Replacement, Release the right clips: step 7, image 1 of 2

Logitech MX Master 3 Battery Replacement, Release the right clips: step 7, image 2 of 2

Gently pry the upper shell and lower case apart to release the clips on the right side of the mouse.
Don't try to fully remove the top shell just yet—another clip and a delicate cable connect the upper shell to the lower case.

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Step 8 Release the final clip

Logitech MX Master 3 Battery Replacement, Release the final clip: step 8, image 1 of 3

Logitech MX Master 3 Battery Replacement, Release the final clip: step 8, image 2 of 3

Logitech MX Master 3 Battery Replacement, Release the final clip: step 8, image 3 of 3

Lay your mouse down onto your work surface, making sure none of the clips re-engage.
Grasp the upper shell and partially lift up the right edge.
Pull the upper shell up and back to release the final clip and separate the upper shell from the lower case.
Still keep the two halves close together—a cable is still tethered to the upper shell.
To reinstall the upper shell, slide the front edge into place first, then press down around the perimeter of the upper shell to engage the remaining clips.

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Step 9 Disconnect the interconnect cable

Logitech MX Master 3 Battery Replacement, Disconnect the interconnect cable: step 9, image 1 of 3

Logitech MX Master 3 Battery Replacement, Disconnect the interconnect cable: step 9, image 2 of 3

Logitech MX Master 3 Battery Replacement, Disconnect the interconnect cable: step 9, image 3 of 3

Be careful not to strain the cable connecting the upper shell to the lower case.
Use the flat end of a spudger to gently lift up the black sliding lock on the interconnect cable socket.
Slide the cable straight out of its socket on the motherboard.
During reassembly, insert the cable into the socket with its blue tab facing out, then push down the sliding lock to secure the cable.

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Step 10 Remove the top half of the mouse

Logitech MX Master 3 Battery Replacement, Remove the top half of the mouse: step 10, image 1 of 1

Remove the upper shell from the lower case.

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Step 11 Disconnect the battery

Logitech MX Master 3 Battery Replacement, Disconnect the battery: step 11, image 1 of 3

Logitech MX Master 3 Battery Replacement, Disconnect the battery: step 11, image 2 of 3

Logitech MX Master 3 Battery Replacement, Disconnect the battery: step 11, image 3 of 3

Use a pair of tweezers 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.

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Step 12 Unscrew the battery housing

Logitech MX Master 3 Battery Replacement, Unscrew the battery housing: step 12, image 1 of 1

Use a Phillips screwdriver to remove the two 3.5 mm-long screws securing the battery housing.

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Step 13 Remove the battery housing

Logitech MX Master 3 Battery Replacement, Remove the battery housing: step 13, image 1 of 1

Remove the battery housing.

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Step 14 Soften the battery adhesive

Logitech MX Master 3 Battery Replacement, Soften the battery adhesive: step 14, image 1 of 1

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.

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Step 15 Separate the battery adhesive

Logitech MX Master 3 Battery Replacement, Separate the battery adhesive: step 15, image 1 of 2

Logitech MX Master 3 Battery Replacement, Separate the battery adhesive: step 15, image 2 of 2

Insert the long edge of an opening pick between the battery and its housing at the side opposite the battery cable.
Push the opening pick under the battery and lift up to pry the battery out of its housing.
Make sure you push underneath the battery and not into it. Don't bend, crease, deform, poke, or puncture the battery—a damaged battery is a potential fire hazard.
If you encounter significant resistance, pause and reheat the adhesive.

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Step 16 Remove the battery

Logitech MX Master 3 Battery Replacement, Remove the battery: step 16, image 1 of 2

Logitech MX Master 3 Battery Replacement, Remove the battery: step 16, image 2 of 2

Tool used on this step:

Tesa 61395 Tape

$5.99

Buy

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.

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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.

7 other people completed this guide.