I tested the Wolfbox 4-in-1 Jump Starter with Air Compressor during a real-world emergency

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When testing products like a remote starter, I usually have to look for a situation in which to use it. However, while testing this Wolfbox starter, the testing opportunity found me. I stopped to pick up an order at a gluten-free bakery and passed two people with a car that wouldn’t start. It’s a pretty common occurrence during these cold upstate New York winters, and the 0 degree temperatures have destroyed yet another car battery. Their car was parked in such a way that I couldn’t get mine close enough to use my jumper cables and one of them was elderly and struggling in the freezing cold. I quickly hooked up the Wolfbox 4-in-1 Jump Starter with Air Compressor (use code popsci10 at checkout for an extra $10 off) on their mid-size SUV and it turned on almost immediately. This is the first time a review product has saved the day.

It can be difficult to recommend products that you hope to never use, but the Wolfbox Multifunctional Jump Starter is a great option for any car emergency kit.

The quick take

This is a truly useful multi-tool for people who want one device to cover flat tires, dead batteries, and basic phone charging. It’s not ultralight and the hose length may be slightly short for some impeller/valve configurations, but the basic functions are solid and the specs back that up.

Design and build

The MegaVolt 24 Air is essentially a dense rectangular brick: 9.37 × 5.28 × 2.17 inches and 5.3 pounds. It sounds big (because it is), but that’s also the point: it’s not about trying to be cute. It’s about trying to be a single object that you can grab when something goes wrong.

The user interface matters more here than usual. The large screen shows real-time pressure during inflation and the controls are designed around simplicity, which is crucial when you’re on the side of the road in the dark. Inflation is simple in that you just choose a mode (car/motorcycle/bike/balloon), set a target pressure and let it run until it turns off.

Integrated cables with clips for battery attachment are long enough to fit comfortably in virtually any under-hood configuration. The clamps hold firmly and attach securely. It feels solid, which is important for instilling confidence.

Inflator Performance: What the Numbers Really Mean

On paper, the inflator specification is 160 PSI with an air flow of 45 L/min. The PSI title is mostly about capacity: most passenger vehicles fall somewhere in the neighborhood of 30 to 45 PSI. The most significant number is the real-world airflow and test duration.

It only took about a minute to re-inflate my SUV tire from 25 to 35 psi. A full pump from flat should take between three and five minutes. It’s pretty standard in terms of speed, but the auto-off feature is nice. It’s also handy to track progress as it balloons so you know how far they have left to go.

The built-in 20-inch hose is long enough for the vast majority of cars, but very large wheels may require you to stretch it all the way. I had no problems on any of the typical road cars I tested it on.

Starter performance

This unit is rated at 4000A peak and is positioned to begin 12V vehicles up to 10L of gasoline or 10L of diesel. Peak current ratings can be shaky depending on brands (and they’re not a direct translation of “how dead is too dead”), but the practical workflow here is what matters:

• It uses clamp indicators to confirm correct connection.
• There is a BOOST procedure for extremely low batteries (forced boost), which is exactly what you want when a battery is too depleted to behave normally.

In the real world, I’ve started three vehicles of varying sizes (thanks for being hard on batteries, winter). There was no problem jumping a crossover SUV in the bakery parking lot, my dad’s 6-cylinder pickup truck, as well as a diesel-powered F-350 shop truck that had been sitting too long. Even after the roughest start, it still had enough juice to get going again without a problem. So you can expect multiple starts with one charge depending on your starting capacity.

Power bank performance

Many car jump starters connect to a USB port which is basically only useful for smartphones. This one is much better:

• Battery capacity: 24,000 mAh (88.8 Wh)
• USB-C Input/Output: up to 65 W (20 V⎓3.25 A)
• USB-A output: up to 18W

This 65W USB-C profile means it can charge many USB-C laptops (especially ultraportables) at normal speeds, and it can quickly charge modern phones/tablets without falling back into sluggish sluggishness.

Charging the device itself is also simple: a 65W USB-C power adapter can provide a full charge in less than two hours.

Flashlight: Bright enough to matter

The built-in flashlight is rated at 400 lumens with constant, SOS, and strobe modes. The light will drain the battery if you use it for a long time, but it is significantly brighter than a smartphone flashlight. It offers steady mode, strobe flashing mode and SOS flashing mode in case you need to signal in an emergency.

Sustainability

Two specifications stand out for something designed to stay put for months and then work right away:

• Operating temperature: -4°F to 140°F
• Water resistance: IP64

He also claims Retention of monitoring costs for 2 yearswith the sound advice to recharge it every six months anyway (which you should do for virtually any emergency lithium device). I can attest that it operates at 0 degrees Fahrenheit. Although I didn’t have two years to let it sit, the battery held its charge easily for several weeks, even with the sharp temperature swings that occur in winter.

Specifications

• Model: MegaVolt 24 Air
• Ability: 24,000 mAh (88.8 Wh)
• Peak starting current: 4000A
• Air compressor: 45 L/min, up to 160 PSI
• USB-C Input/Output: up to 65 W (20 V⎓3.25 A)
• USB-A output: up to 18W
• Light: 400 lumen LED with SOS/strobe
• Weight: 5.3 pounds
• Size: 2.17″D × 5.28″W × 9.37″H
• Rated environment: -4°F to 140°F, IP64
• In the box: storage bag, connection clips, 65 W USB-C cable, three air nozzles, 20″ hose

Verdict

If you want the simplest possible approach to an automobile emergency, the Wolfbox makes a strong case because it’s not just a jump starter with an inflator, it’s an inflator fast enough to be useful and a jump starter with enough headroom for most real-world situations. This versatility justifies its heavy construction.

Right now, you can use the code popsci10 to get an extra $10 off when you check out.

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