# 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.

- [Original product page](https://best-deals.pro/product/mjum-cordless-grease-gun-kit-21v)
- [View offer](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- Market: US
- Language: en-US
- Currency: USD
- Brand: MJUM
- Model: Cordless Grease Gun Kit
- Price: 89.99 USD
- Previous price: 139.99 USD
- Discount: 36%
- Price checked: 2026-11-14T05:30:17.068Z
- Rating: 5 / 5
- Reviews: 4

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## 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.

## 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.

## 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. \(included\)

## Before you buy

- 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.

## In the box

- Two 21V batteries (Check selected pack): Feature text claims two batteries. Product details also state two lithium-ion batteries are included.
- Charger (Check selected pack)
- Hard carrying case (Check selected pack): Mentioned in feature text, but no explicit package inventory is provided.
- Shoulder strap (Check selected pack): Mentioned in feature text, but no explicit package inventory is provided.
- 90° coupler (Check selected pack): Mentioned in feature text, but no explicit package inventory is provided.
- Lock-on coupler (Check selected pack): Mentioned in feature text, but no explicit package inventory is provided.
- Pointed tip coupler (Check selected pack): Mentioned in feature text, but no explicit package inventory is provided.

## 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.

## Customer feedback

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.

## Alternative options

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- [G.Gun Grease Gun - Fast & Easy Greasing. 10,000psi Output. Hands Free Foot Operation & Pressure Relief Valve. Mess & Waste Free, with G.Coupler & 2m Hydraulic Hose. Heavy Duty Industrial Strength](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [LockNLube 2-in-1 Pneumatic Grease Gun with Single Shot & Continuous Modes. Single-Shot and Continuous delivery Modes in one Grease Gun\! Easily Switch delivery Mode with The Sliding Selection Lever.](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [LockNLube Pressure Return Valve for Use with Cordless Grease Guns. No More Pressure Locks\! Returns Grease to The Tube. Releases Hose backpressure.](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [LockNLube Premium Pistol Grip Grease Gun with 20" Hose, In-Line Hose Swivel, and LockNLube® Grease Coupler](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [LockNLube 48" Universal Grease Hose](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
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- [Seesii 2-in-1 Electric Grease Gun, 12000 PSI, with 2 Batteries and 48” Hose \| 5.3 oz/min High Flow, Cordless Grease Gun 14 oz with LED Light & Quick Release Coupler for Trucks, Farm & Heavy Equipment](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [Electric Grease Gun Kit, 12000 PSI, 2-in-1, 2 x 4.0Ah Batteries Cordless \| 5.3 oz/min Flow, Battery Powered Grease Gun 14 oz with LED Light & Quick Release Coupler for Trucks, Farm & Heavy Equipment](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [Cordless Electric Grease Gun Kit, 12,000 PSI, Two 21V 4.5Ah Batteries, 39.4-Inch Ho...](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)
- [Cordless Grease Gun 12000 PSI Compatible with DeWalt 20V Battery \| Tool Only, Batte...](https://best-deals.pro/visit/mjum-cordless-grease-gun-kit-21v)

## Images

![MJUM Cordless Grease Gun Kit, 21V — 1](https://best-deals.pro/i/i2AaVhTr0C5PkrOlAGdOIAxWXxsM_y_D2-bRswS6UulL_2jNUxr75jn5nzOuF71BIz6x9-aQXKbEJkpSpBSKP19SX8EAOlh72gTEGfdG-GVt35TSUIDHokxk.jpg)

![MJUM Cordless Grease Gun Kit, 21V — 2](https://best-deals.pro/i/PQX11ucvqxUipr8IrLUUzmm228ZD4rKLvpZyVKSrNURP7zSHj4yL-Fy52wmzJsVz3Ckmiw0JM3jGXXHK-DMu1M996m68cjdoiaE697E5Byf7Io_myAsi2i2X.jpg)

![MJUM Cordless Grease Gun Kit, 21V — 3](https://best-deals.pro/i/jVn7U_6qjVES8Ev7qep2CmmbPeE2qw0lWoDkR1l35c7xFd6wmdX9AwXBg-daYlBY4_7RHU16yBX8YNlG2Vh5exCHSwpZgPMcInqPNe-OL36OI1O9dB_G-ohF.jpg)

![MJUM Cordless Grease Gun Kit, 21V — 4](https://best-deals.pro/i/t7QOD0DiWh_LvliZLts9NmseV4E4Zv4AIcLihqdG2y-P0BLqCrRFGm-sMCAwg7MsgHSuTA6oQ51D0vK6Hj0pDzXt_Frn3kjqag8WhBgg5H7c6-ZIsRAeW-tb.jpg)

![MJUM Cordless Grease Gun Kit, 21V — 5](https://best-deals.pro/i/Y3g-TfY1UEs2Oz09Dw0YUOpbxbnIGmp-5eXX_CvnUk6EueRMs2M8Mq4Tvxp3dnBstFZaVEWneYmzUQ2jmH16Ejy5zND8vFE5hIWKHIlM1Z1zcJWQBr0r4lz0.jpg)

![MJUM Cordless Grease Gun Kit, 21V — 6](https://best-deals.pro/i/soECPkXyJ7O0HLS5py8niEu1yyhZTj-8XI-D2QCyWFobp8dlk3YjxKT_ZjsPnrTw7k0_BH9O45VdmK4H3lwZ0WgaGVnheG30oQyV4OUF_hvTdZjfZ3rGshIo.jpg)

![MJUM Cordless Grease Gun Kit, 21V — 7](https://best-deals.pro/i/T8YbzPF-QItsoFDSGVHNWO-m5jNfU94v1qI-DApk8ofJ7wusiML1wxJTzOD0RZVCGJYEuKNw-WV2OvCJQaRlgU0HJaODN-83Ov2brbDe43FN_S7hFH3QyWRg.jpg)