Logitech Mx Master 3 Battery Replacement Repair Guide

Difficulty

Moderate

Steps

Time Required

                          10 - 30 minutes

Sections

How to Power Off a Logitech MX Master 3
1 step
Mouse Feet (That Cover Screws)
3 steps
How to Open the Logitech MX Master 3
5 steps
Battery
5 steps

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Introduction

This guide requires removing the mouse feet. 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.

What you need

Step 1

              Turn off the mouse

Before you begin, flip the mouse’s power switch into the OFF position.

Before you begin, flip the mouse’s power switch into the OFF position.

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Step 2

              Heat the mouse foot

If you’re planning to reuse your existing mouse feet, note that the adhesive needs to be thoroughly heated to cleanly remove them.
Heat an iOpener and apply it to the left mouse foot for two minutes.
A hair dryer or heat gun may also be used, but be careful not to overheat the mouse—the internal battery is susceptible to heat damage.

If you’re planning to reuse your existing mouse feet, note that the adhesive needs to be thoroughly heated to cleanly remove them.

Heat an iOpener and apply it to the left mouse foot for two minutes.

A hair dryer or heat gun may also be used, but be careful not to overheat the mouse—the internal battery is susceptible to heat damage.

Step 3

              Separate the mouse foot adhesive

Slide an opening pick under an edge of the left mouse foot.
Go slowly, and make sure the pick is underneath both the foot and its adhesive layer if you want to reuse the foot. It’s easy to separate the foot from its adhesive.
If the foot feels stuck, apply more heat before continuing.
Slide the pick under the rest of the foot until you can lift it off the mouse.
Remove the foot.

Slide an opening pick under an edge of the left mouse foot.

Go slowly, and make sure the pick is underneath both the foot and its adhesive layer if you want to reuse the foot. It’s easy to separate the foot from its adhesive.

If the foot feels stuck, apply more heat before continuing.

Slide the pick under the rest of the foot until you can lift it off the mouse.

Remove the foot.

Step 4

              Clean off the old adhesive

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.
Peel the adhesive off.
Before installing new feet or reinstalling old ones, wipe away any adhesive residue from the mouse with a lint-free cloth and high-concentration isopropyl alcohol.

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.

Peel the adhesive off.

Before installing new feet or reinstalling old ones, wipe away any adhesive residue from the mouse with a lint-free cloth and high-concentration isopropyl alcohol.

Step 5

              Remove the remaining two mouse feet

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

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

Step 6

              Remove the case screws

Remove the six screws securing the two halves of the mouse together:
Use a Phillips #00 driver to remove five 4.3 mm screws.
Use a T5 Torx driver to remove the 4.2 mm screw.

Remove the six screws securing the two halves of the mouse together:

Use a Phillips #00 driver to remove five 4.3 mm screws.

Use a T5 Torx driver to remove the 4.2 mm screw.

Step 7

              Unclip the mouse case

There are clips all around the perimeter of the mouse case holding the two halves together. It is easiest to pull them apart starting at the back of the mouse.
Don’t completely separate the two halves yet—they’re still tethered together by a delicate cable.
Grasp the mouse case at the back and pull the two halves apart slightly, so there’s a gap at the back of the mouse.
Move one hand toward the front of the mouse and continue pulling the two halves straight apart.
As you reach the front of the mouse you will need to slide the base toward the front of the mouse (down in the photos) so that the two halves clear each other.
Some of the clips are particularly stubborn and may require some force to pull apart. Apply steady, slowly increasing pressure to force the halves away from each other.

There are clips all around the perimeter of the mouse case holding the two halves together. It is easiest to pull them apart starting at the back of the mouse.

Don’t completely separate the two halves yet—they’re still tethered together by a delicate cable.

Grasp the mouse case at the back and pull the two halves apart slightly, so there’s a gap at the back of the mouse.

Move one hand toward the front of the mouse and continue pulling the two halves straight apart.

As you reach the front of the mouse you will need to slide the base toward the front of the mouse (down in the photos) so that the two halves clear each other.

Some of the clips are particularly stubborn and may require some force to pull apart. Apply steady, slowly increasing pressure to force the halves away from each other.

Step 8

              Disconnect the interconnect cable

Use the flat end of a spudger to gently lift the black sliding lock on the interconnect cable socket until it stops and the cable is no longer locked in.
Slide the interconnect cable out of its socket on the motherboard.

Use the flat end of a spudger to gently lift the black sliding lock on the interconnect cable socket until it stops and the cable is no longer locked in.

Slide the interconnect cable out of its socket on the motherboard.

Step 9

              Remove the top half of the mouse

Remove the top half of the mouse.

Remove the top half of the mouse.

Step 10

              Disconnect the battery

Use a pair of blunt tweezers to grasp the sides of the battery connector.
Pull the connector up and out of its socket, gently rocking it back and forth to loosen the clips securing it.

Use a pair of blunt tweezers to grasp the sides of the battery connector.

Pull the connector up and out of its socket, gently rocking it back and forth to loosen the clips securing it.

Step 11

              Unscrew the battery housing

Use a PH00 driver to remove the two 3.5 mm screws securing the battery housing.

Use a PH00 driver to remove the two 3.5 mm screws securing the battery housing.

Step 12

              Remove the battery housing

Remove the battery housing.

Remove the battery housing.

Step 13

              Heat the battery adhesive

Heat an iOpener and apply it to the back of the battery housing for two minutes.
A hair dryer or heat gun may also be used, but be careful not to overheat the battery as it is susceptible to heat damage.

Heat an iOpener and apply it to the back of the battery housing for two minutes.

A hair dryer or heat gun may also be used, but be careful not to overheat the battery as it is susceptible to heat damage.

Step 14

              Remove the battery

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 off of its housing.
Make sure you push underneath the battery and not into it. Don’t bend or deform the battery.
If you encounter significant resistance, pause and heat the adhesive further.
Remove the battery.
It is likely you can reuse the old adhesive with the new battery. If you wish to replace the adhesive instead, remove the old adhesive and wipe away any adhesive residue with a lint-free cloth and high-concentration isopropyl alcohol.
Follow this guide to install new precut adhesive.

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 off of its housing.

Make sure you push underneath the battery and not into it. Don’t bend or deform the battery.

If you encounter significant resistance, pause and heat the adhesive further.

Remove the battery.

It is likely you can reuse the old adhesive with the new battery. If you wish to replace the adhesive instead, remove the old adhesive and wipe away any adhesive residue with a lint-free cloth and high-concentration isopropyl alcohol.

Follow this guide to install new precut adhesive.

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 installing.

To reassemble your device, follow the above steps in reverse order.

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

Repair didn’t go as planned? Check out our Answers community for troubleshooting help.

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Author

                    Adam O'Camb

Member since: 04/11/2015

173,479 Reputation

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Kaspars Lubins - May 3, 2022

Pretty straight forward manual. Is there also a manual or spare parts available for the scroll wheel and/or its parts?

Fabian Torres - Aug 29, 2022

Hi! any clue of where to buy the replacement battery?

Дмитрий Притупов - Jan 15, 2023

Introduction#

What you need#

Introduction

What you need