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Wireless mechanical keyboards: Bluetooth, 2.4 GHz and battery life

Updated

Most mid-range mechanical keyboards are now wireless, usually in three ways at once: a USB-C cable, Bluetooth, and a small USB dongle on 2.4 GHz. Listings call this “tri-mode”. The modes aren't interchangeable, though, and the battery figure on the box rarely tells you how long the board will last on your desk.

This guide explains what each connection is good for, whether wireless holds up for gaming, how to read battery claims, and which wireless boards in our catalogue suit which kind of use.

Bluetooth or a 2.4 GHz dongle

Bluetooth needs no dongle, works with phones and tablets, and most boards can remember several devices and switch between them with a key combination. Logitech's MX Mechanical, for example, swaps between up to three devices at the press of a key[4]. The downside is speed: Bluetooth keyboards report to the computer far less often than wired or dongle connections, and the link shares its bandwidth with everything else nearby[1]. For typing you won't notice. For fast games you might.

2.4 GHz uses a dongle made for that keyboard. It's a dedicated link, so it's faster and steadier than Bluetooth, and many boards run it at the same 1,000 Hz as a cable. The cost is a USB port and a small part that's easy to lose. A dongle normally serves one computer at a time[1].

A good rule: use the dongle on the computer you sit at every day, and Bluetooth for the laptop, tablet or work machine you switch to now and then. That's exactly what tri-mode boards are built for.

Is wireless fine for gaming?

On 2.4 GHz, yes, for nearly everyone. The added delay is typically a millisecond or two, against something more like 7 to 20 ms over Bluetooth[1]. Those are third-party figures rather than lab tests, and they vary by board, but they're the right order of magnitude: the dongle is close to a cable, and Bluetooth isn't.

Where wired still wins is very high polling rates. Boards advertising 8,000 Hz, such as the Keychron C3 Pro 8K or the magnetic boards in our magnetic keyboard guide, generally reach that figure over the cable. High polling also drains a battery much faster, which is one reason most competitive gaming boards stay wired[1].

Reading battery figures

Makers quote battery life in two ways, and neither is a promise. Some give the capacity in mAh, which tells you the size of the battery but not how fast the board uses it. Others give hours, which are almost always measured with the lighting off.

Lighting is by far the biggest drain. Corsair quotes up to 2,400 hours on Bluetooth for the K70 CORE TKL WIRELESS with RGB off[2], but just up to 266 hours with the LEDs off for the Corsair K65 Plus Wireless Tactile[3]. Different boards, very different numbers, and neither figure applies once the lights go on. If you want weeks between charges, turn the backlight off or down; most boards have a shortcut for it.

For a rough comparison, capacity is still useful between similar boards. Keychron's V Max boards and the K8 Max carry 4,000 mAh, the slim Keychron K3 Max carries 1,550 mAh to keep its weight down[6], and the Epomaker TH80 V2 Pro carries 10,000 mAh[5]. A bigger battery adds weight, which matters if the board goes in a bag.

The HHKB (PFU) HHKB Professional HYBRID Type-S is the odd one out: it runs on two AA batteries[7]. That sounds old-fashioned, but it means you can swap in fresh ones in seconds, and a worn-out cell is never a reason to replace the keyboard.

Practical things to check

Dongle placement. 2.4 GHz shares the airwaves with Wi-Fi, and a dongle in a port at the back of a metal PC case can drop keys. If you get stutters, move it to a front port or use a short USB extension so it sits nearer the keyboard[1].

Dongle storage. Check the board has somewhere to keep the dongle. Replacements are specific to the brand and not always sold separately.

Sleep and wake. Wireless boards sleep after a few minutes to save power, and the first key you press may only wake them up. That's normal, but worth knowing if you type a password straight after sitting down.

Work laptops. Some employers block Bluetooth pairing or unrecognised USB devices on managed laptops. If that's you, a board that also works over a cable is the safer buy, since the cable is the one mode that rarely gets locked down.

Firmware and remapping. On boards that run QMK or VIA, such as Keychron's Max series, the keymap is stored on the board, so it applies in every mode, though you may need the cable to change it. On boards with proprietary software, check whether the software sees the board over wireless or only when it's plugged in.

UK layout. Wireless is common, UK ISO less so. Keychron, Corsair and Logitech all sell UK versions of their wireless boards; many smaller brands only sell ANSI. Our ANSI or ISO guide explains why that matters.

Wireless boards by use

One board for home and work. A tri-mode board with a plastic case keeps the weight sensible while giving you the dongle at home and Bluetooth elsewhere.

Carrying it about. Low-profile boards are thinner and lighter, at the cost of switch choice: they take low-profile switches only.

Gaming with the cable off. A 2.4 GHz board at 1,000 Hz is fine for most players; the competitive end mostly stays wired.

Sources

  1. KeebsForAll: 2.4GHz wireless protocols, what you need to know
  2. Corsair UK: K70 CORE TKL WIRELESS product page
  3. Corsair UK: K65 PLUS WIRELESS Tactile product page
  4. Logitech UK: MX Mechanical product page
  5. Epomaker: TH80 V2 Pro product page
  6. Keychron UK: K3 Max ISO layout
  7. PC Gamer: HHKB Professional HYBRID Type-S review