The Best Portable Car Jump Starters: 5 Picks Compared

The GB40 wins Best Overall because it matches what most drivers actually need. It is rated for engines up to 6.0L gas and 3.0L diesel, which covers nearly every sedan, crossover and half-ton pickup on US roads. It is also small, roughly the size of a paperback book, so it fits in a glovebox instead of taking up trunk space.

What sets it apart is the safety design. The clamps do not spark if they touch each other, and the unit refuses to send power if you connect the wrong terminals. That matters because a dead battery usually happens at night, in the rain, to someone who has never jumped a car before. Cheap packs often skip that protection.

It also holds its charge in storage. A jump starter is a tool you buy and ignore, so a pack that quietly drains itself over six months is useless. NOCO built this one to sit and wait, which is why it has stayed a best seller for years with a very large review history behind it.

The honest limit is capacity. At 1000 peak amps and a 6.0L gas ceiling, it is not the right tool for a 6.7L diesel or a loaded work van. It also does nothing but jump start. There is no air compressor for a soft tire and no 12V outlet, so it is a single-job tool.

Buy it if you drive a normal passenger vehicle and want the safest, simplest option here. Skip it if you tow or drive a big diesel, where the NOCO Boost HD GB70 is the direct step up, or if a flat tire worries you more than a dead battery, in which case the GOOLOO A3 with its built-in compressor makes more sense.

The AstroAI S8 wins Best Budget because it does the important things without charging premium money. It uses smart jumper cables that check the connection before sending any current, which is the single feature that keeps a first-time user out of trouble. Plenty of cheap packs skip that, and the ones that do are not worth saving money on.

Its rated range is up to 6.0L gas and 3.0L diesel, the same as the NOCO Boost GB40, even though it lists 1500 peak amps against the GB40’s 1000. That gap is a useful lesson: peak amp numbers are set by each brand and are not measured the same way. The engine size rating is the more honest number to shop by.

It also works as a phone power bank, charges over USB-C, and ships in a case that keeps the clamps and cable tidy. For a tool that lives in a trunk for years between uses, that case matters more than it sounds.

The real limitation is history. AstroAI has not been selling jump starters as long as NOCO or Clore, so there is less long-term data on how these packs hold up after five winters. That is not a red flag, but it is a reason the GB40 still takes the top spot.

Buy it if you want a safe, capable jump starter for a normal car and price is the deciding factor, or if you want a second one for a partner’s vehicle. Pick the NOCO Boost GB40 instead if you want the longest proven record, or the NOCO Boost HD GB70 if you drive anything with a big diesel under the hood.

The GB70 wins Best for Trucks and Big Engines because it is the only pick here with a published rating that clearly covers heavy vehicles. NOCO lists it for engines up to 8.0L gas and 6.0L diesel. A 6.7L Power Stroke or a 6.6L Duramax sits inside that number, and none of the compact packs in this guide can say the same.

The difference is not just the battery. The cables are thicker and the clamps are bigger, because a cold diesel pulls far more current than a four-cylinder sedan. Undersized clamps get hot and drop voltage exactly when you need it most, which is why stepping up matters more on a truck than the peak amp figure suggests.

It also adds a 12V outlet, which the GB40 does not have. That lets it run a plug-in tire inflator or a 12V accessory, so it covers more roadside trouble even though it has no compressor of its own. The 400 lumen light is a real work light rather than a token LED.

The honest drawback is cost and size. It is around twice the price of the GB40 and much heavier, so it is not a glovebox tool. If your biggest vehicle is a crossover, you are paying for headroom you will never use.

Buy it if you drive a full-size truck, a van, an RV or a diesel, or if you want one pack that covers a mixed household fleet. Choose the NOCO Boost GB40 instead if everything you own is a normal passenger car, or the Clore Jump-N-Carry JNC660 if the vehicles are usually parked in a shop rather than out on the road.

The GOOLOO A3 wins Best for Flat Tires and Roadside Kits because it solves two roadside problems instead of one. A slow leak is more common than a dead battery, and most jump starters leave you stranded for that. This one has a 150 PSI compressor with auto shutoff built into the same box, so you set a pressure and let it run.

Its rated engine range is also the widest here, up to 9.0L gas and 6.5L diesel. That covers almost anything a private owner drives. Combined with USB-A and USB-C ports for phones, it works as a single trunk kit rather than one item in a pile of gear.

The tradeoff is size. It is a box, not a pocket pack, and it needs real trunk space next to your other gear. The compressor is also honest about what it is: fine for topping off a car tire, slow and noisy on a 35 inch truck tire, and happier with a rest between tires. A dedicated unit from our portable air compressor comparison will always be faster.

The other caution is the numbers. GOOLOO lists 3000 peak amps, three times the NOCO Boost GB40, while the real engine ratings are much closer together. Peak amps are a marketing figure across brands, so shop by engine size instead.

Buy it if you want one purchase that covers a dead battery and a soft tire, especially for long drives or a second family car. Pick the NOCO Boost GB40 instead if compact size and a long proven record matter more, or the NOCO Boost HD GB70 if you need published capacity for a heavy diesel.

The JNC660 wins Best for Cold Weather and Shop Use because it is built on a completely different idea from the rest of this guide. Instead of a small lithium pack that delivers a short burst, it carries a full AGM lead-acid battery that can hold voltage through a long, stubborn crank. Clore rates it at 425 cranking amps, which is a sustained figure rather than a peak number, and that is the rating that matters when an engine will not catch on the first try.

Cold is where it pulls ahead. Small lithium packs lose usable output in deep winter and often need to be warmed in your hands before they will fire. A lead-acid box handles freezing garages better, which is why shops and farms have used this exact unit for years.

The cables are the other quiet advantage. At 46 inches they reach batteries buried under covers, in trunks or behind fender wells, without repositioning the car. The battery inside is also replaceable, so the tool can outlive its first battery instead of going in the trash.

The real cost is convenience. It weighs around 18 pounds, so it lives on a shelf, not in your car. More importantly, a lead-acid battery must be kept topped up. Leave this on a shelf for a year and it may be dead when you need it, which is the opposite of how the lithium packs behave.

Buy it if you jump vehicles often, work in the cold, and can plug it in between uses. If it will ride in a trunk and get ignored, pick the NOCO Boost GB40 or, for a big diesel, the NOCO Boost HD GB70 instead.