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Head to head · Prices checked Oct 21, 2026

Jamesdonkey RS2 4.0 vs Keychron J5

Get the Jamesdonkey RS2 4.0 for the 4,000 mAh battery and knob. Get the Keychron J5 for via.

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 J5

  • Layout size

    96%

    100%

  • Battery

    4,000 mAh

    3,750 mAh

  • Switch options

    Linear

    Clicky, Linear, Tactile

  • Knob

    Yes

    No

  • VIA

    No

    Yes

KeebFinder scores

How we score
  • Jamesdonkey RS2 4.0
  • Keychron J5
Performance
58
70
Build quality
71
69
Productivity
93
62
Customizability
82
86
Portability
53
48

What they share

  • Connection: Bluetooth, 2.4 GHz, Wired
  • Hot-swappable
  • QMK
  • Keycaps: PBT
See every spec side by side

From real owners

What owners say

Ratings and quotes collected from verified store reviews, including the critical ones.

Jamesdonkey RS2 4.0

No owner reviews collected yet.

Keychron J5

3.7

3 owner reviews

Praise
“Totally enjoying this keyboard. Weight gives a quality feel. Love north facing RGB and effects. Price is in a sweet spot. Happy that I didn’t allow lack of reviews to affect my decision. Highly recommended.”
M.T.Verified buyer· via Keychron
Critique
“Originally had purchased (2) J5 keyboards for staff in the office in January. Upon delivery, the top number row of one of the keyboards did not work and had to be RMA'd, within a few weeks the second keyboard refused to work altogether. Received a replacement…”
T.Verified buyer· via Keychron

Full specs

Jamesdonkey RS2 4.0 vs Keychron J5 specs

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

10 of 24 specs differ

Jamesdonkey RS2 4.0

Keychron J5

Typing & switches

Switch options

Linear
Clicky, Linear, Tactile

Hot-swappable

Yes
Yes

Mount style

Gasket Mount
—

Sound dampening

Yes
No

Layout

Layout size

96%
100%

Layout standard

ANSI
ANSI

Ergonomics

Standard
Standard

Knob

Yes
No

Display

None
None

Media keys

Yes
Yes

Connectivity & battery

Connection

Bluetooth, 2.4 GHz, Wired
Bluetooth, 2.4 GHz, Wired

Max polling rate

—
1,000 Hz

Battery

4,000 mAhBetter
3,750 mAh

USB-C

Yes
No

Build & materials

Case material

Aluminum
—

Plate material

—
Steel

Keycaps

PBT
PBT

Weight

1,150 g
—

Dimensions

34 x 405 x 138 mm
—

Backlight

RGB
RGB, north-facing

Firmware & software

QMK

Yes
Yes

VIA

No
Yes

Mac & Windows

Yes
No

Extras

Released

2024
2025

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
Keychron J52 stores
  • KeychronHK

    In stock
    $59Visit
  • AmazonGlobal

    Check price
    Visit

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