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Head to head · Prices checked Oct 21, 2026

Jamesdonkey RS2 4.0 vs Keychron K3 V3

Get the Jamesdonkey RS2 4.0 for the 4,000 mAh battery.

What actually differs

The differences that matter

Skip the 40-row spec sheet. These are the specs that change how each board feels, sounds, and fits your desk.

Jamesdonkey RS2 4.0

Keychron K3 V3

  • Layout size

    96%

    75%

  • Connection

    Bluetooth, 2.4 GHz, Wired

    Bluetooth, Wired

  • Battery

    4,000 mAh

    1,550 mAh

  • Low profile

    No

    Yes

  • Case material

    Aluminum

    ABS, Aluminum

KeebFinder scores

How we score
  • Jamesdonkey RS2 4.0
  • Keychron K3 V3
Performance
58
82
Build quality
71
82
Productivity
93
70
Customizability
82
89
Portability
53
74

What they share

  • Hot-swappable
  • QMK
See every spec side by side

Full specs

Jamesdonkey RS2 4.0 vs Keychron K3 V3 specs

Every tracked spec, side by side. Rows marked with a dot differ between the boards.

17 of 26 specs differ

Jamesdonkey RS2 4.0

Keychron K3 V3

Typing & switches

Switch options

Linear
Clicky, Linear, Tactile

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
PCB Mount, Top Mount

Low profile

No
Yes

Sound dampening

Yes
No

Layout

Layout size

96%
75%

Layout standard

ANSI
ANSI, ISO, ISO-DE, ISO-Nordic, ISO-SW, ISO-UK

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
None

Media keys

Yes
Yes

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, Wired

Max polling rate

—
1,000 Hz

Battery

4,000 mAhBetter
1,550 mAh

USB-C

Yes
No

Build & materials

Case material

Aluminum
ABS, Aluminum

Keycaps

PBT
ABS, PBT

Weight

1,150 g
540 g

Dimensions

34 x 405 x 138 mm
19 x 306 x 116 mm

Typing angle

—
3°

Backlight

RGB
RGB, north-facing

Firmware & software

QMK

Yes
Yes

VIA

No
Yes

N-key rollover

No
Yes

Mac & Windows

Yes
Yes

Extras

Released

2024
2024

Where to buy

Compare prices

Live prices from the stores we track, cheapest in-stock offer first.

Lowest price across stores, Amazon excluded.

  • MechkeysCN

    In stock
    $99Visit
  • AmazonGlobal

    Check price
    ~$99Visit
  • WhatGeekCN

    Out of stock
    $108Visit
  • KeychronHK

    In stock
    $84Visit
  • AmazonGlobal

    Check price
    ~$84Visit
  • Keychron (DE)DE

    Out of stock
    $109Visit

Prices in USD are converted to your currency and can change at any time. KeebFinder may earn a commission when you buy through these links, at no extra cost to you.

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