The Best Car Battery Jump Starters

The safety system is the real reason to buy this one. NOCO's UltraSafe clamps stay dead until they detect a properly connected 12V battery. Get the polarity backwards and nothing happens — no spark, no smoke, no damaged alternator. That matters more than any amp figure if you've never jumped a car before, or if you're handing the unit to a family member who hasn't either. Most of the risk in jump-starting is human error, and this design removes it.

It covers the engine in almost every driveway in America. NOCO rates the GB40 for gas engines up to 6.0 liters and diesels up to 3.0 liters, which takes in nearly every sedan, crossover and half-ton pickup on the road. NOCO claims up to 20 starts per charge. If you drive a Camry, a CR-V, a Golf or an F-150 with the 5.0, you're comfortably inside its range with room to spare.

It's genuinely small. At 2.5 pounds and roughly the footprint of a paperback, it slides into a glovebox or a center console and stays there. That's the whole point. A jump starter you have to remember to bring is a jump starter you won't have when the battery dies at the airport parking garage. This one just lives in the car.

The extras earn their keep on a bad night. There's a 100-lumen LED with seven modes, including SOS and strobe, which is exactly what you want when you're crouched over an engine bay in the dark on a shoulder. The USB power bank will get a dead phone back to life so you can call someone. Neither feature is a reason to buy it on its own, but together they make it useful beyond the one emergency it was bought for.

It's built to survive living in a car. The IP65-rated housing with rubberized over-molding shrugs off rain, road dust and the occasional drop onto concrete. That's a real consideration for something that spends its life rattling around under a seat or in a trunk with your tools. Owners who keep it in the vehicle year-round generally report it still works when they finally reach for it.

Flaws but not dealbreakers

It runs out of headroom on big engines. A 1000-amp peak sounds like a lot until you're facing a 6.7-liter diesel on a subfreezing morning. Owners of large diesel pickups and V10s report needing multiple attempts or getting nothing at all. If that's your vehicle, step up to the GB70 rather than hoping this one gets there.

The cables are short. They reach fine on a sedan. On a lifted truck or anything with a deep, crowded engine bay, you may find yourself balancing the unit on the intake manifold because the clamps won't quite reach where you want them. It's an annoyance rather than a dealbreaker, but it's the complaint that comes up most.

Heat is its enemy. Lithium cells degrade in sustained high temperatures, and a closed car in summer gets brutally hot. If you park outside in Phoenix or Houston, expect the pack to lose capacity faster than the spec sheet implies, and plan on topping it off more often than NOCO's one-year storage claim suggests.

NOCO covers the GB40 with a one-year limited warranty.

This is the one that starts a big diesel. NOCO rates it for 8.0-liter gas and 6.0-liter diesel engines, which covers a Power Stroke, a Cummins, a Duramax and the largest gas V8s. Published reviews single out its cold-morning diesel performance as the thing that separates it from lighter lithium units. If a no-start on a job site costs you a day's work, that headroom is the whole purchase.

It inherits the same foolproof clamps. The UltraSafe system scales up unchanged: the clamps won't energize until they see a correctly connected, discharged 12V battery. That's more valuable at 2000 amps, not less. You're most likely to fumble a connection at 6 a.m. in the cold with gloves on, and this is the unit that forgives that.

You get many more starts per charge. NOCO claims up to 40 starts on a full charge, double the GB40's figure. If you're the person in the crew whose truck has the jump starter, or you're helping out at a trailhead where nobody else brought one, that reserve matters. It recharges in about six hours from empty.

The light is a proper work light. At 400 lumens it's four times brighter than the GB40's, with the same seven modes. That's enough to actually see what you're doing under a truck hood at night rather than just locate the battery terminals. Small thing, but it turns the unit into something you'll grab for non-emergencies too.

Flaws but not dealbreakers

It's not a glovebox device. At 5 pounds and roughly 9 by 6 inches, it needs a dedicated spot — a toolbox, a cab organizer, a trunk cubby. Plan for where it lives before you buy, because a unit rolling loose behind the seat is a projectile in a hard stop.

Most people don't need this much. If you drive a sedan or a crossover, you're paying for capacity you'll never use and carrying weight you don't need. The GB40 does the same job on the same engines with the same safety system. Buy up only if your engine actually demands it.

It still won't love a hot summer. Same lithium chemistry, same caveat. Storing it in a truck bed toolbox that hits 140°F on a July afternoon will shorten its usable life, regardless of how rugged the housing is.

NOCO covers the GB70 with a one-year limited warranty.

The built-in compressor is the reason to pick this over a plain jump starter. It runs to 120 PSI with an AUTOSTOP function, so you set the target pressure and it shuts itself off. That handles a slow-leaking tire on the shoulder, a soft bike tire before a ride, or a kid's soccer ball on a Saturday. Nothing else here does that, and low tire pressure is a far more common problem than a dead battery.

It has enough starting power for most of what you'd tow with. DEWALT rates it at 1600 peak amps, good for engines up to a V8. That covers full-size pickups, big SUVs and most work vans. It's short of the GB70 for the largest diesels, but it's well beyond what a passenger car ever asks for.

The charging ports are the modern ones. You get USB-A at 15W and USB-C at 25W, which means it'll actually fast-charge a recent phone rather than trickling it. If you're camping, tailgating or working away from an outlet, that's a real second job for the unit.

The details show shop-tool thinking. The powder-coated metal clamps store on the unit itself, so they're not swinging loose in a truck bed. There's an alternator check to tell you whether the charging system is the actual problem, and a reverse-polarity alarm that warns you before you make a mistake. The compressor has a ten-minute auto shutoff so leaving it running won't cook it.

Flaws but not dealbreakers

It's heavy and awkward. At 17.3 pounds and roughly 13 by 12 inches, this is a two-hands, dedicated-storage-space tool. It goes in a truck bed, a shop shelf or a trunk corner. It is not something you toss in a hatchback and forget about.

The clamps warn you, they don't stop you. A reverse-polarity alarm is not the same as clamps that refuse to energize. You still have to connect it correctly, in the right order, and pay attention to the alarm if it sounds. For a confident DIYer that's fine. For a first-timer, the NOCO approach is safer.

It needs regular maintenance charging. Like other lead-acid-style packs, it self-discharges meaningfully faster than a lithium unit. Leave it in a trunk for six months and there's a good chance it's flat when you need it. Owners who skip the top-off routine are the ones who report it failing at the worst moment.

It's built to start engines all day, every day. The 22Ah Clore Proformer battery is designed specifically for jump-starting duty rather than general storage. Lithium units can lose capacity when you deep-cycle them back to back; this one is made for exactly that. If you're a mechanic starting a dozen cars a week, that's the difference between a tool that lasts years and one that fades in a season.

The cables and clamps are the ones you actually want. You get 46 inches of 2 AWG cable, which is heavy-gauge and long enough to reach the battery on a truck without perching the unit on the engine. Thin cables and short reach are the two things people complain about most on consumer jump starters, and this one solves both by being unapologetically industrial.

It tells you where it stands. An onboard voltmeter shows the charge status of the internal battery, so you know before you need it rather than after. There's also a 12V DC outlet for running accessories. No app, no digital display, nothing to fail — just a gauge that works.

It has decades of shop credibility behind it. This design has been a fixture in service bays and fleet garages for a very long time, and it's still there. Published reviews and professional users consistently point to it as the benchmark for high-amp, repeated-use starting. That kind of longevity is hard to fake.

Flaws but not dealbreakers

Eighteen pounds is a commitment. It's roughly 16 by 14 inches and weighs as much as a bag of dog food. This is a shop-floor or service-truck tool. Nobody is carrying this to a stranded car across a parking lot without regretting it.

Skip the maintenance charging and it dies on the shelf. Lead-acid cells sulfate when left discharged, and this pack self-discharges far faster than lithium. Plan on charging it every month or two whether you've used it or not. Owners who treat it like a set-and-forget device are the ones who find it useless in an emergency.

There's no safety net on the connection. No spark-proof clamps, no automatic polarity lockout — just an alarm-free, connect-it-right-or-else design. You need to know the correct procedure: positive first, then negative to a ground point away from the battery. For a pro that's second nature. For a first-time user it's a genuine risk.

It's spartan by modern standards. No USB output, no work light, no AC outlet. If you want your jump starter to also charge a phone or light up an engine bay, this isn't it.