An MX Keys that won't charge is usually one of three issues: the USB-C cable is faulty, the keyboard's USB-C port is damaged, or the lithium-polymer battery has reached end of life. On MX Keys older than 4 years, it is almost always the battery (1500-2000 charge cycles reached). On newer keyboards, it is more often a cable or port issue. Diagnosis takes 5 minutes with another quality USB-C cable.
Diagnostic
Test in this order: (1) swap to another USB-C cable — use a data + charge cable, not charge-only; (2) try another USB-C port (on a computer, certified wall charger); (3) if the LED still doesn't light when plugged in, leave the keyboard out of cold storage or pause it for 24h; (4) if after these tests the charge LED still doesn't blink, the battery is most likely failing. The keyboard averages 4-6 years of battery life under heavy use.
Méthode
- 1
Try another quality USB-C cable (data + charge), and switch USB ports too.
- 2
Plug it in for a full hour without using the keyboard — a deeply discharged battery needs time to start charging.
- 3
If the charge LED stays off despite valid cables and ports, the battery or internal port is the cause.
- 4
Order a universal MX Keys battery (€10) or contact us for workshop diagnosis if you don't want to disassemble.
FAQ
How long does an MX Keys battery last?
Logitech rates 5 months without backlight, 10 days with. In charge cycles, expect 1500-2000 before significant degradation. For professional use at 40h/week, that means 4 to 6 years before the first noticeable autonomy drop.
Is the USB-C port of my MX Keys replaceable?
Yes, but it's complex: the USB-C port is soldered on the motherboard. Replacement requires desoldering. The simplest fix: replace the whole motherboard (€15). If you don't want to disassemble, contact us for a workshop return.
How much does an MX Keys battery cost?
€10 each from our catalog. The battery is universal for standard MX Keys and MX Keys Mini (both use the same lithium-polymer cell). Ships with double-sided adhesive for refitting.
An MX Keys that won't charge is rarely beyond saving. Test cable + port first, then a €10 battery if needed. A €15 max operation that extends keyboard life by 4-6 years.