MJUM Cordless Grease Gun Kit, 21V

The MJUM Cordless Grease Gun Kit is a battery-powered grease gun listing a maximum pressure of 14,000 PSI and a flow rate of 8 oz/min. Its rotating handle, LED light, dual grease-loading options and claimed two-battery kit are aimed at maintenance work on vehicles and equipment.

At a glance

Claimed maximum output is 14,000 PSI and 8 oz/min. The listing compares this with manual hand pumps, but provides no independent performance results.
Accepts 14 oz cartridges or bulk grease loaded with the T-handle plunger.
Rotating handle switches between pistol and straight grip positions, with a built-in LED light for dim work areas.
The listing claims two 21V batteries and a charger, and says the tool is compatible with Makita 20V batteries. Check fit and compatibility for your batteries before relying on that claim.

Price

$89.99Save 36%

Reference price: ~~$139.99~~

Price checked: Nov 14, 2026

View offer

Pros and cons

Pros

Two grease-loading methods support cartridge use or bulk-grease loading.
Rotating grip and built-in LED are useful for varied access positions and poorly lit work areas.
The listing describes a kit with two batteries and a charger, rather than a tool-only package.

Technical specifications

11 specifications

Identity
Brand	MJUM
Model	Cordless Grease Gun Kit

Performance and compatibility
Voltage in title	21V
Maximum pressure	14,000 PSI
Flow rate	8 oz/min
Grease cartridge size	14 oz
Grease types	NLGI #0, #1, and #2
Battery compatibility claim	compatible with Makita 20V batteries

Dimensions and weight
Dimensions listed	20.4 x 15.2 x 4 inches
Weight listed	12.87 pounds

Power
Batteries	2 Lithium Ion batteries required. (included)

What to know before buying

Listing details to confirm

The listing gives a 14,000 PSI maximum and 8 oz/min flow in its title and feature text, but these are manufacturer claims, not independently verified results. Its stated 21V batteries and claimed compatibility with Makita 20V batteries refer to different voltage labels, so confirm battery fit and system compatibility before purchase. The listing also describes a complete accessory kit but does not provide an explicit package inventory.

What’s in the box

Two 21V batteriesCheck selected pack
ChargerCheck selected pack
Hard carrying caseCheck selected pack
Shoulder strapCheck selected pack
90° couplerCheck selected pack
Lock-on couplerCheck selected pack
Pointed tip couplerCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

Vehicle, farm and heavy-equipment maintenance where cordless grease application and cartridge or bulk loading are useful.
Users who need a rotating grip and light to reach fittings in confined or dim work areas.

Less suited to

Buyers who need independently confirmed pressure or flow performance, or a verified battery-platform match.

MJUM Cordless Grease Gun Kit, 21V · photo 2 — Additional product photo 2

Customer reviews on Amazon

5 / 5 · 4 ratings

5 stars100%100%
4 stars0%0%
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The supplied evidence contains aggregate ratings only, with a small number of ratings and all in the five-star category. That is a limited positive signal, not enough to identify customer-praised features or judge reliability, pressure, flow, battery fit or kit completeness.

Frequently asked questions

What pressure and flow does the listing claim?

The title and feature text claim up to 14,000 PSI and up to 8 oz/min. These are listing claims, not independently verified performance.

Can it use cartridges and bulk grease?

The listing says it accepts standard 14 oz cartridges and bulk or drum grease using the T-handle plunger.

Are batteries included?

The product details state that two lithium-ion batteries are included, and the feature text also claims two 21V batteries and a charger. Confirm the selected listing's kit contents before buying.

Will my Makita 20V battery work with it?

The listing claims compatibility with Makita 20V batteries, while also describing included 21V batteries. Verify fit and compatibility with the seller or listing before relying on an existing battery.