Best Portable Jump Starters for Your Garage

Portable jump starters let you restart a dead battery without waiting for another car or a roadside service truck. Most current models use a lithium pack instead of lead-acid, so they are small enough to keep in a glovebox or trunk bin year-round. The right pick depends on your vehicle’s engine size and how often you expect to use it, not just the peak-amp number printed on the box.

Peak-amp ratings vary widely between a compact daily-driver unit and a truck-capable one, and not every portable jump starter is rated for diesel engines. These five checks help you match a unit to your vehicle before you buy.

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1. Match peak amps to your engine, not just the headline number

A portable jump starter’s peak-amp rating is a marketing number, not a guarantee it will start your specific engine. The manufacturer’s own displacement rating for gas and diesel is the more useful spec. The NOCO Boost Plus GB40 is rated to 1,000 peak amps, covering most cars and SUVs up to a 6.0L gas or 3.0L diesel engine. A larger truck or a diesel engine beyond that range needs a higher-rated unit like the GB70 below, not a second attempt with the same small jump starter.

2. Compare portable jump starters by their safety features, not just price

Reverse-polarity protection and spark-proof clamps matter more on a lithium jump starter than on an old lead-acid pack, because a short at the clamps can damage the internal battery management circuit. Both NOCO units here list spark-proof, reverse-polarity-protected clamps in their own specifications. Confirm the same language on any unit you’re comparing before assuming it has the same protection.

3. Pick the amp range for how you’ll actually use it

The GOOLOO GP4000 lists a 4,000-peak-amp rating and a 24,000mAh internal battery at a lower price than either NOCO unit, which makes it a reasonable budget pick for an occasional-use daily car. For a truck, a diesel engine, or equipment you jump-start more than a few times a year, the NOCO Boost HD GB70‘s 2,000-peak-amp, 6.0L-diesel rating is built for heavier, more frequent use rather than an occasional dead battery.

We have not run a side-by-side durability test between these three; the ratings above come from each manufacturer’s own published specifications, and real-world cold-weather performance can vary by unit.

4. Check what’s actually included before you buy

Most portable jump starters ship with a USB charging cable, a 12V DC output for the unit’s own battery, and a built-in LED light, but tire inflators, air compressors, and OBD-II diagnostic features are separate products even when a listing photo shows a similar-looking case. Read the included-accessories list for the specific model rather than assuming one jump starter does everything.

5. Store and charge it correctly between uses

A lithium jump starter self-discharges slowly, but most manufacturers still recommend topping it off every few months rather than leaving it fully depleted in a cold trunk all winter. AAA’s guide to jump-starting a battery also covers the cable-connection order worth reviewing even when you’re using a portable unit instead of another car.

Pair a portable jump starter with the socket and wrench sizes in one of our mechanics tool sets picks, and the terminal-cleaning step is easier with a cordless impact wrench on hand for stuck battery-terminal bolts.

Compare NOCO Boost Plus GB40 listings, compare GOOLOO GP4000 listings, or compare NOCO Boost HD GB70 listings.