Replacing the battery of an MX Keys is one of the most cost-effective DIY repairs in our catalog: €10 part, 25 minutes of work, and the keyboard runs another 4-6 years. Logitech does not offer this service, but the battery is mechanically accessible once the keyboard is open. This tutorial guides you step by step, with pitfalls to avoid (glued battery, fragile connector, hidden Torx screws).
Diagnostic
When to replace the battery: autonomy under 3 days without backlight (vs 5 months new), keyboard shuts off as soon as USB-C cable is unplugged, or — danger sign — battery visibly swells under center keys (creating a bulge). If swollen, handle with care: a swollen LiPo can ignite if punctured. Never try to puncture or deform it.
Méthode
- 1
Remove all keys from the keyboard (minimum Space + ESC + Shift row). Locate Torx T5 screws hidden underneath.
- 2
Unscrew the 6-8 Torx T5 screws and progressively insert a pick along the edge to unstick the lower case (plastic clips + adhesive).
- 3
Once opened, locate the battery: black rectangle about 70×30 mm under the metal plate. Gently unplug the two-wire connector (red + black).
- 4
Peel off the battery with a plastic spudger (held by double-sided adhesive). Be patient — don't force pull at risk of puncture.
- 5
Install the new battery in the same place, plug the connector, close the case, screw back, replace the keys. Plug in USB-C for the first full charge cycle.
FAQ
What tools do I need to replace the MX Keys battery?
A Torx T5 screwdriver (essential — not T6 or T4), a plastic pick or iFixit opening tool, a plastic spudger to detach the battery. Avoid metal tools: short-circuit or PCB scratch risk. Full kit €5-10 from any tools shop.
How long does the replacement take?
25 minutes for a first attempt, 12 minutes if you've opened an MX Keys before. Removing the keys takes the most time (10 minutes). Case teardown 5 minutes. Battery swap 5 minutes. Reassembly 5 minutes.
What do I do if my battery is swollen?
Handle with CARE. Never puncture a swollen LiPo. Store in a fireproof place (metal box, terracotta pot) while waiting to drop at a specialized recycling center. The new battery should not be swollen on receipt — if it is, contact us for replacement.
Can I charge a new MX Keys battery before installing it?
No, don't try. The battery is designed to be charged via the keyboard's integrated circuit which manages voltage/current. An external charge can damage the battery or pose fire risk. Install first, then charge via USB-C.
25 minutes, €10, and your MX Keys runs another 4-6 years on battery. One of the most cost-effective DIY repairs on the consumer keyboard market.