Best Cordless Grease Gun: 5 Battery Grease Guns Compared (2026)

Compare the picks

Specifications are manufacturer rated, as published on each listing and collected 10 October 2026. Where a listing contradicts itself, both figures are shown.

How we scored them

Each cordless grease gun is scored out of 10 on performance, build, value, safety and warranty, with the weights published on our How We Pick method page. None states a UL, ETL or CSA listing, so all score zero on safety, and four listings state no warranty term.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

What the listings tell you

We compared five cordless grease gun listings. Four list a maximum operating pressure of 12,000 PSI, while one states 10,000 PSI. Delivery rates range from 5.3 oz/min to 8 oz/min on the four listings that publish one, while one brand omits flow rate entirely. Only one manufacturer provides a stated warranty term, and none publishes a UL, ETL or CSA electrical safety certification. Two models sell as bare tools without batteries, while three arrive as complete kits.

Buying guide: choosing the best cordless grease gun

Operating pressure and flow rate

Working pressure determines whether a grease gun can overcome hardened grease in clogged zerks and tight machine tolerances. Four models compared here deliver 12,000 PSI, while one provides 10,000 PSI. Flow rate determines how quickly grease dispenses once the channel is clear, with published rates between 5.3 oz/min and 8 oz/min. A variable-speed trigger lets you dispense slowly into small sealed bearings or run wide open when filling large steering knuckles.

Hose reach and coupler adapters

Hose length dictates whether you can reach difficult fittings on trucks and tractors without hoisting the grease gun into cramped positions. Flexible hoses in this roundup range from 19 in to 48 in. Specialized couplers, including 90-degree adapters, quick-release fittings and needle nozzles, allow you to service recessed zerks and sealed joints without leaking grease around the collar.

Coupler styles and secure zerk locking

Coupler selection directly affects how cleanly and quickly you can service equipment. Standard hydraulic couplers snap over standard zerks but can be difficult to pull free when line pressure remains high. Quick-release couplers feature thumb levers with hardened locking jaws that hold fast under 12,000 PSI without grease escaping around the fitting. A 90-degree adapter solves access problems where vehicle crossmembers or suspension arms sit square against the fitting. Needle dispensers slide past rubber boots to lubricate ball joints without tearing the protective rubber.

Dual-mode handles and shop ergonomics

Handle design plays a major role in comfort when greasing dozens of zerks on tractors or commercial trailers. Models with rotating or dual-mode handles switch between straight in-line and pistol configurations. Straight mode aligns the grip with the steel barrel, creating a narrow profile that slides into cramped machinery compartments. Pistol mode balances the weight closer to your wrist, making one-handed operation easier while your other hand directs the coupler. Because bare tools weigh 5.64 lb to 8.97 lb and kits with batteries reach 12.78 lb, adjustable shoulder straps help carry the load during prolonged fleet maintenance.

Grease types and cartridge compatibility

The models in this roundup support NLGI #0, #1, and #2 greases, accommodating standard 14 oz cartridges (or 400cc equivalents) along with bulk loading directly into the barrel. NLGI #2 is the common standard for truck chassis and wheel bearings, whereas thinner NLGI #1 and #0 grades flow better in colder weather. Thick NLGI #2 grease creates heavy resistance in long grease lines, where an electric motor delivering up to 12,000 PSI pushes grease through fittings that would stall a manual hand pump.

Purging air pockets and priming

Trapped air pockets inside the grease barrel are the main cause of motor stalling or loss of grease flow after refilling. When inserting a fresh 14 oz cartridge or drawing bulk grease through suction loading, air can settle between the follower plate and the pump inlet. Using the steel T-handle plunger to compress the grease charge while opening the manual air bleeder valve releases trapped air bubbles until solid grease flows through the head, restoring delivery rates up to 8 oz/min.

Battery platforms and kits

Bare tools appeal to buyers who already own batteries from major brands like DeWalt. Complete kits provide dedicated batteries, a charger and a storage case, making them ready to work out of the box. Some third-party kits also accept Makita 18V batteries, providing extra flexibility if you already own that platform.

Cartridge and bulk grease loading

Most cordless grease guns accommodate standard 14 oz grease cartridges (or 400cc equivalent) alongside bulk loading from buckets. A clean loading system with an air bleed valve and a sturdy follower rod keeps air pockets from stalling grease flow midway through a service interval.

Removing wheels for suspension access

Servicing tie-rod ends, ball joints and control arm zerks often requires pulling off the front wheels. When removing stubborn wheel fasteners, check how much torque you need to remove lug nuts before starting your suspension work.

Frequently Asked Questions

What pressure does a cordless grease gun produce?

The cordless grease guns in this comparison produce between 10,000 PSI and 12,000 PSI of maximum pressure. This operating range provides sufficient force to push grease through blocked fittings, heavy machinery pins and suspension joints.

What flow rate should I expect from a battery grease gun?

Published delivery rates among these models range from 5.3 oz/min to 8 oz/min. Higher flow rates speed up maintenance when filling large cavities on tractors and commercial trucks, while variable-speed triggers allow slower dispensing for precision bearings.

Can I use my existing power tool batteries with a cordless grease gun?

Several models are built to run on existing power tool batteries. In this lineup, two bare tools accept DeWalt 20V lithium-ion batteries, while two kit models accept Makita 18V battery packs in addition to their supplied batteries.

What size grease cartridges do these guns take?

These units accept standard 14 oz grease cartridges or 400cc cartridges, and they also support bulk grease loading directly into the barrel. NLGI #0, #1, and #2 grease grades are supported across routine automotive and cold-weather agricultural work.

Why does hose length matter on a cordless grease gun?

Because battery grease guns weigh between 5.64 lb and 12.78 lb, longer hoses measuring 39 in to 48 in let you rest the tool on the ground or a creeper while guiding the coupler onto hard-to-reach fittings without holding the full weight aloft.

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