Head-to-head · Best Portable Tire Inflators

Milwaukee M18 Inflator (2848-20) vs Slime Cordless Pro Power

Which is the better buy? Side-by-side on rating, price, strengths, and watch-outs — with the published ratings we averaged to get there.

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The short answer

Milwaukee M18 Inflator (2848-20) comes out ahead by a narrow margin (4.6 vs 4.5). The gap is mostly about Milwaukee M18 tool owners and pros who want the fastest, most accurate cordless tire top-off — read the strengths below before deciding.

Higher ratedRanked #1 in Best Portable Tire Inflators

Milwaukee M18 Inflator (2848-20)

4.6

3 sources2 derived$197.97as of Aug 1

Already in Milwaukee's battery ecosystem, or just want the fastest and most accurate cordless top-off available? The M18 2848-20 is the inflator to get. Pro Tool Reviews and Tool Box Buzz both rank it near the top of the category. Watch the total cost once a battery and charger go in the cart, and note there is no 12V backup.

Strengths

— Fastest cordless inflator tested, topping off an F-150 tire in about 52 seconds
— Highly accurate digital gauge with auto shut-off, within ~2 PSI of a manual gauge
— Runs noticeably quieter and lower-pitched than rival cordless inflators

Watch-outs

— Tool-only price plus an M18 battery and charger makes it the most expensive pick
— Heavy at around 9 lb with a battery attached
— No 12V backup if the battery dies, unlike hybrid Slime/AVID units

$197.97 · Check Price on Amazon Full review →

Ranked #2 in Best Portable Tire Inflators

Slime Cordless Pro Power

4.5

2 sourcesall derived$116.04as of Aug 1

Self-contained is the Slime Cordless Pro Power's advantage: it runs cordless on its own battery, drops back to a 12V cable when that dies, and auto-stops once it hits your target pressure. Pro Tool Reviews scored it 9.4/10 and Automoblog 85/100. It works slower and at lower pressure than the Milwaukee and Viair, yet the hybrid power and auto shut-off make it the most foolproof choice for most drivers.

Strengths

— Hybrid design works cordless on its internal battery or wired via the included 12V cable
— Inflate-Right Technology auto-shuts off at the set pressure, no gauge-watching needed
— Fills up to three standard car tires from flat per charge

Watch-outs

— Roughly four-hour USB-C recharge is slow
— Fills more slowly than the Milwaukee M18 or Viair 88P at about three minutes per tire
— 99 PSI ceiling is lower than the 120-150 PSI rivals

$116.04 · Check Price on Amazon Full review →

Derived means the reviewer published no score, so one was inferred from their written verdict. Everything else is a number the publisher printed. How we rank.

How they stack up

Milwaukee M18 Inflator (2848-20)

The fastest and most accurate cordless pick here, ahead of the hybrid Slime Cordless Pro Power and the budget AVID Power on speed and precision. Unlike the corded Viair 88P it needs no 12V outlet, but it also lacks their 12V fallback and costs the most once a battery is added.

Slime Cordless Pro Power

The most self-contained option, the only one here that runs cordless and still has a 12V fallback if the battery dies. It is slower and lower-pressure than the Milwaukee M18 Inflator (2848-20) and the Viair 88P, but more foolproof than older corded inflators and a step up in features from the budget AVID Power.

Specs side-by-side

Spec	Milwaukee M18 Inflator (2848-20)	Slime Cordless Pro Power
Max PSI	150	99
Power Source	M18 RedLithium battery	Internal battery + 12V cable
Accuracy	Within ~2 PSI	—
Fill Time	~52 sec (6 PSI top-up, F-150)	~3 min per tire
Weight	~9 lb with battery	—
Auto Shut-Off	Yes, digital preset	Inflate-Right Technology
Max Tire Size	33 inch	—
Material	Plastic	—
Dimensions	14.7"L x 7"W x 8.3"H	—
Display	—	Clear-view LED

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