Mayoki Air Compressor for Pneumatic Brad Nailer Stapler, Compatible with Milwaukee 18V Battery (Tool Only), 120 PSI Oil Free Cordless Portable Compressor, 160PSI Digital Tire Inflator for Pickup, Tire

What I tested

I’ve been using the Mayoki cordless compressor as a grab-and-go inflator and as a portable source for light pneumatic tasks. It’s a compact, oil-free unit that runs on Milwaukee 18V batteries (M18), weighs roughly 2.6 pounds, and promises two distinct jobs: top off tires up to 160 PSI and run small air tools at up to 120 PSI. On paper that sounds ambitious. In practice, it’s better at some tasks than others, but it fills a useful gap that a typical tire inflator or a full-size compressor doesn’t.

Setup and compatibility

Fitting an M18 battery is straightforward and the battery interface feels secure, with no wiggle once latched. There’s built-in low-voltage protection, which is reassuring if you keep older packs around; the unit will shut down rather than deep-discharge your battery. In my use, the compressor felt happiest on 4.0Ah or 5.0Ah packs. It’ll run on smaller packs, but expect shorter cycles and more frequent cut-offs.

The kit includes a valve adapter, ball needle, air nozzle, a high-pressure hose with quick-connect for pneumatic tools, and a shoulder strap. The accessories stow neatly, and the quick-connect saves time when swapping from inflating to tools.

Controls and readout

The interface is simple. You set a target pressure on the digital panel, choose your unit (PSI, BAR, KPA, kg/cm²), and hit start. The auto shut-off stops the pump right at the setpoint. In practice, the gauge was within a couple of PSI of my handheld reference gauges, which is good enough for field use. There’s a memory function that recalls your last set pressure, which is handy for recurring tasks (for me that’s 36 PSI on the daily-driver tires and 90–100 PSI for brad nailers).

The built-in LED is brighter than I expected; it’s genuinely useful for roadside work and checking valve stems in the dark.

Tire inflation performance

For everyday top-ups—cars, SUVs, lawn equipment—the Mayoki does well. It’s faster than lightweight 12V plug-in inflators and far more convenient if you already run M18 batteries. The set-and-stop behavior works cleanly: set 36 PSI, clip onto the valve, hit start, and it shuts off on its own. As with many inflators, you’ll see a small pressure drop when you disconnect the chuck, so I often set the target 1 PSI higher if I care about precision.

Inflating from flat on larger truck tires is a longer wait, and this isn’t the tool I’d choose to seat beads or fill high-volume off-road tires from single digits. But for periodic top-ups and slow-leak maintenance, it’s exactly what a portable should be: compact, reliable, and safe to toss in the trunk.

A small tip from use: connect the short built-in hose directly to the tire for the quickest fills. The longer accessory hose adds internal volume and drag you don’t need for tire work.

Running pneumatic nailers and small air tools

This is where the Mayoki differentiates itself from most inflators. With the high-pressure hose attached, you can set an operating pressure (up to 120 PSI) and run burst-style pneumatic tools. My focus was on trim and punch-list work with a brad nailer and crown stapler.

• Brad nailer (18-gauge): No trouble driving 1.5–2 inch brads into softwood and hardwood trim. You can fire a small series of shots before the compressor cycles, and it recovers quickly. It’s not meant for rapid-fire production work, but for small rooms, touch-ups, and ladder work, it’s surprisingly competent.

• Stapler: Similar story—short bursts are fine. Expect the unit to cycle between a handful of triggers.

• Rivet/rivet-nut tools: Occasional pulls are feasible. As with nailers, give the compressor a moment to catch up between cycles.

• Continuous-flow tools (die grinders, blow guns for extended use): Not the right match. The compressor simply doesn’t have the air volume to keep continuous tools fed.

The included high-pressure hose has a manual flow valve in-line. It’s a safety-forward choice, but it also means you’ll typically use two hands: one for the tool, one for the valve, unless you rig up a stand or hang the compressor from the strap. I ended up using the shoulder strap more than I expected; hanging the unit off a joist or wearing it frees both hands and keeps the compressor from skating around as the stiff hose tugs at it.

Build quality, noise, and ergonomics

Fit and finish are decent for a lightweight cordless unit. The plastics aren’t as overbuilt as a shop compressor, but the carry points feel sturdy and the battery shoe is solid. The hose material is heat-resistant and hasn’t shown softening after longer runs, which is important on compact compressors that tend to run hotter.

Noise-wise, it’s comparable to other small, oil-free compressors. It’s not whisper-quiet, and you won’t want to run it in a nursery at midnight, but it’s absolutely fine for garages, driveways, and jobsite work. The tone is a typical high-pitched oil-free whir rather than a deep thump.

One small caution: don’t store the unit with the hose sharply kinked where it meets the body. That’s a stress point on any compact compressor. Coil the hose loosely or keep it straight in storage to avoid fatigue at the fitting.

At 2.6 pounds (plus battery), the size and weight are a real advantage. I’m comfortable climbing a ladder with it on a strap to tack return molding without dragging an air hose and extension cord.

Battery life and runtime

Runtime depends heavily on task and battery capacity. Popping trim nails and taking brief pauses to let it recover barely moves a 5.0Ah pack. Tire top-offs consume more, especially on larger tires, but it still feels efficient. The low-voltage cut-off works as advertised; when a smaller pack sags under load, the unit will stop and save the battery. If you plan to run air tools for more than quick bursts, bring a spare battery or step up to a higher-capacity pack.

Accessories and little touches

• The digital gauge’s unit toggle covers the bases and the backlight is genuinely readable outdoors.
• The memory function is a small thing that saves time day-to-day.
• The accessory adapters and needle are the usual fare, but they fit and seal properly.
• The quick-connect on the high-pressure hose is standard and connects cleanly to brad nailers and staplers.
• The strap is more than an afterthought; it’s practical when you need two hands free.

Mayoki includes a 5-year warranty, which is longer than I expect at this price tier and adds confidence for a unit that may live in a trunk or tool bag.

Limitations to consider

• Air volume is limited. This is not a substitute for a jobsite compressor for framing, roofing, or any continuous tool.
• The stiff hose can tug the unit around; plan on using the strap or securing the compressor near where you work.
• As with many auto shut-off inflators, expect a slight pressure drop after disconnecting from a tire; set your target a hair high if exactness matters.
• It’s not quiet. Expect normal small-compressor noise.

Who it’s for

• Tradespeople and DIYers who already own Milwaukee M18 batteries and want a compact, dual-use inflator/compressor.
• Punch-list carpenters doing trim touch-ups or installing a few pieces without setting up a full compressor and hose.
• Drivers who want a trunk-friendly inflator with better speed and control than a 12V cigarette-lighter unit.
• Homeowners maintaining lawn equipment, bikes, and sports gear.

Who should skip it: Anyone needing sustained airflow for larger pneumatic tools or fast-cycle production work. You’ll be happier with a traditional tanked compressor.

Recommendation

I recommend the Mayoki cordless compressor for users who value portability and already live in the M18 ecosystem. It’s a smart, compact inflator that doubles as a capable, stopgap air source for brad nailers, staplers, and occasional pneumatic tasks. The digital controls are intuitive, the auto shut-off is accurate enough for everyday use, and the 5-year warranty is a welcome confidence booster. It’s not a replacement for a full shop compressor, and it isn’t quiet, but as a lightweight, go-anywhere tool to top off tires and handle light air work without dragging cords and hoses, it earns its spot in the kit.