Logitech MX Master 4 Battery Replacement
Spencer Day and 4 other contributors
Last updated on Dec 18, 2025
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OEM Guide
iFixit collaborated with the manufacturer to make this guide.
Logitech
Logitech and iFixit are working together to help people repair their Logitech devices.
Introduction
Go to step 1 ↓Follow this guide to replace a worn-out or dead battery in your Logitech MX Master 4 wireless mouse.
It’s natural for batteries to lose capacity as they age. If your mouse dies quickly and doesn't hold a charge, it may be time to replace the battery.
For safety, perform this repair when your battery is below 15% charge. Any charged lithium-ion battery can be hazardous if punctured or damaged. If your battery looks puffy or swollen, take appropriate precautions.
What you need
Fix Kit
This kit contains all the parts and tools needed to complete this guide.
Parts
Tools
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Spudger4.9
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Flip the mouse's power switch down into the OFF position and unplug any cables.
Ask FixBot
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Use a Phillips screwdriver to remove the six screws securing the two halves of the mouse together:
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Five 4.3 mm‑long screws
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One 6.3 mm‑long recessed screw
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Insert the flat end of a spudger in the seam between the two halves of the mouse, near the power switch.
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Slide the spudger along the seam to the very front of the mouse.
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Gently pry the bottom half of the mouse away from the top half, until you feel and hear the first clip release.
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Grip the top half of the mouse in one hand, and the bottom half in your other hand.
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Slowly pull the back of the mouse apart until you feel the last clip on the front release.
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Flip the top half of the mouse over the right side and use a sturdy object to prop it up, so you can access the battery.
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Use a Phillips screwdriver to remove the three 4.4 mm‑long screws securing the battery.
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Use your fingers to lift the battery straight up and remove it.
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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.
Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.
Reuse or Recycle—Never put discarded electronic parts in household waste. Visit Logitech Recycling to find your nearest recycling points, including the option to mail back old devices to Logitech for free if there’s no convenient solution in your area. You can also take your e-waste to any R2 or e-Stewards certified recycler. And don’t let good working parts or repaired devices die a slow death in your sock drawer—pass them along to someone who can use them.
Share your experience—Leave a comment here or send your feedback directly to Logitech at repair@logitech.com to help shape future repair guides and product design.
