The Best Car Emergency Kits

A jump starter beats jumper cables because it doesn't need anyone else. Cables are only useful if a second driver stops, pops the hood and lets you clamp onto their battery. In an empty lot at night, or a garage where you can't get a car nose-to-nose, that's a long wait. The GB40 turns a dead battery into a two-minute problem you solve alone. That's the single biggest upgrade you can make to a car kit.

The specs cover most of what people drive. NOCO rates it at 1,000 amps peak, good for gas engines up to 6.0 liters and diesel up to 3.0 liters, with up to 20 starts per charge. That's every sedan, crossover and small truck on a normal commute. Owners routinely report starting V6 crossovers and cars that had been sitting for weeks, and a fair number mention using it on other people's cars more often than their own.

Cold is where lithium pulls ahead. A lead-acid battery can lose up to 60% of its cranking power at 0°F, which is exactly when you need it most. Lithium jump starters hold roughly 70–80% of their charge after a year in storage. If you park outside in a place with real winters, that difference is the whole argument.

The extras aren't filler. There's a 100-lumen LED with seven modes including SOS and strobe, so you get a work light and a visibility signal in the same box. The USB power bank matters more than it sounds — if you're stranded, a phone at 4% is its own emergency. The IP65 housing and rubber over-molding mean it survives living in a trunk.

Flaws but not dealbreakers

It's not a kit. There's no first aid, no reflective triangle, no gloves, no tow strap. If a tire goes flat, the GB40 does nothing for you. Most people should pair it with a supply bag, which is why we also recommend one below.

It self-discharges, and owners bring this up more than any other issue. Leave it in a trunk for a year without topping it off and you may find it low exactly when you need it. Set a reminder to recharge it every few months. A related annoyance: the flashlight can be bumped on in a bag and quietly drain the pack.

It stops at 6.0L gas and 3.0L diesel. That's fine for nearly everything, but if you drive a heavy-duty diesel pickup, you want the bigger unit.

Most roadside trouble isn't dramatic. It's a scraped hand, a loose bumper clip, a tarp that needs tying down, a bad headache two hours from home. A stocked bag handles that spread, and the Thrive is the version of it we'd point most people toward. At 4.5 pounds and about 12.6 by 6.8 by 5 inches, it disappears into a trunk corner instead of eating your cargo space.

The bag itself is the part cheap kits get wrong. Thrive uses 600D nylon canvas with a water-resistant shell and separate compartments, which sounds like marketing until you've had a zipper split and dumped 80 loose pieces into a spare tire well. Owners consistently describe the case as the reason they'd buy it again, and several mention repurposing it as a household first aid bag.

It's a genuinely good gift for a new driver. Parents buying for a teenager come up repeatedly in owner feedback, and it makes sense: a 17-year-old isn't going to assemble this themselves, and having a bag in the trunk beats having nothing when they call you from a shoulder.

Add to it and it gets much better. Owners who like this kit tend to describe what they added — a mylar blanket, a folding shovel, road flares, a window-breaking tool. That's the right instinct for any pre-made kit. A mylar blanket alone reflects up to 90% of body heat and weighs under two ounces.

Flaws but not dealbreakers

Piece count flatters kits like this. A lot of the 104 pieces are individual adhesive bandages. Judge it on the cables, the case and the tools, not the number on the label.

The jumper cables are the usual compromise. AAA recommends 12–16 feet so cables can reach between vehicles that aren't perfectly aligned, and thin-gauge cables struggle on six-cylinder and larger engines. If you drive anything with real displacement, treat the cables here as a backup to a jump starter.

The first aid contents aren't stated as ANSI/ISEA Z308.1-2015 compliant, and one recurring owner complaint is that there are no cones or triangles in the box. Buy a reflective triangle separately — it's cheap, reusable and legal everywhere.

You don't need a premium kit in every vehicle you own. If you have a second car, a commuter that never leaves a 20-mile radius, or a kid heading to college, this covers the situations that actually come up. The bag runs about 14 by 8.7 by 6.4 inches and 3.6 pounds, so it rides in a back seat or a spare tire well without you thinking about it.

The item list is smarter than most cheap kits. A tow rope and a safety hammer aren't standard at this level, and both matter — one gets you off a shoulder, the other gets you out of a car after a wreck. There's also a reflective vest, which is the item people forget and the one that keeps you visible when you're standing next to traffic.

Buy it understanding what it is: a first layer, not a last one. Owner feedback is broadly positive but candid, with a recurring note that the components feel built for a single use. For an emergency kit that's a fair trade — you'd rather have adequate cables in the trunk than excellent cables you never bought.

Flaws but not dealbreakers

Component quality is the obvious compromise. Several owners describe the contents as low-grade and wouldn't count on getting repeated use out of any one piece. That's tolerable for a backup kit and not what you want as your only kit on a long trip.

The listing doesn't specify jumper cable gauge or length. Assume they're thin, and assume they're better suited to a four-cylinder sedan than a V8 truck.

Displacement is the whole reason this exists. The GB40 tops out at 6.0L gas and 3.0L diesel, which covers cars and light trucks and stops short of heavy-duty pickups. The GB70's 2,000 amps and 8.0L gas / 6.0L diesel rating clears that bar. If you tow, plow, farm, or drive a diesel three-quarter-ton, this is the one that starts on a cold morning.

It's also a better tool in the dark. The LED steps up from 100 to 400 lumens, which is the difference between finding a battery terminal and actually seeing what you're doing under a hood at 6 a.m. Same seven modes, same SOS and strobe. The IP65 housing and rubberized shell carry over too.

Professional mechanics and people with equipment fleets are a visible chunk of owner feedback here, which is a decent signal for a device you're trusting once a year. Owners describe using it across multiple vehicles, farm machinery and coworkers' cars over years of ownership. At 40 starts per charge, it's a shared resource, not a personal one.

The trade-off is size and charge time. It's about 4.4 pounds and 8.8 by 6 by 2.8 inches — still glove-box adjacent, but noticeably more object than the GB40. It takes 6 hours to recharge instead of 3.

Flaws but not dealbreakers

It costs meaningfully more than the GB40 for capability most drivers will never use. If your biggest engine is a V6 crossover, you're paying for headroom that sits idle.

It has the same storage self-discharge behavior as the GB40, so it needs the same periodic top-off. And like every jump starter, it does nothing for a flat tire, a first aid situation or visibility — it's one tool, not a kit.

A recurring owner frustration is that replacement batteries aren't sold separately, so a pack that degrades after a few years becomes a whole-unit replacement.