The 8 Best Portable Jump Starters of 2026

A 3.0-liter diesel ceiling is the first thing to know about the GB40. Gas engines up to 6.0 liters, most half-ton pickups, every sedan, an ATV, an outboard — all fine, and the Clore below is what handles the rest. Inside that boundary this is the one we hand people who want to stop thinking about it: a pack small enough to live in a glovebox, with clamps that will not spark and a connection that refuses to go through backwards.

The rest is deliberately simple. NOCO rates it at up to 20 starts per charge and about three hours to refill from a wall outlet, and the built-in light runs seven modes including a strobe. It is UL listed, it doubles as a phone power bank over USB, and the whole thing drops into the microfiber bag that comes with it.

The habit that keeps a GB40 useful is a reminder in your phone. A lithium pack that sits in a cold truck all winter bleeds charge quietly, and nothing about a flat pack announces itself until you are standing in a parking lot with the key in your hand. Top it up every three or four months and it will be there; skip it for a year and you are carrying a brick.

Eighteen pounds and better than a foot tall is the whole story of the JNC660: this is a shop tool with a handle, not something that rides in a console. What the weight buys is a 22 amp-hour AGM battery — a real lead-acid bank rather than a lithium cell the size of a phone — and 46 inches of number 2 gauge cable that reaches across an engine bay instead of stretching in from the fender.

That combination is why it lives in the barn and rides out on the flatbed. Lead-acid reserve is what turns over a cold diesel tractor, a grain truck, or a piece of equipment that has been sitting since October, and the built-in voltmeter tells you where the pack stands before you pull the handle. There is a 12-volt DC outlet for accessories as well.

It does ask for upkeep. Lead-acid self-discharges on the shelf, so plan a monthly top-up and a spot near an outlet, and plan on two hands and a clear path whenever you move it. That is also why it lasts: a big AGM battery is far more forgiving of a missed month than a small lithium pack, and it does not care how cold the shed gets.

Where it earns its place for us is the situation nobody plans for — a tractor or a diesel truck that is dead where it sits, in weather, with nobody to call. That is the job this box was built for, and it is a job the pocket packs here cannot do. For a sedan in a driveway, eighteen pounds is more tool than you need.

Five thousand amps and a rating for 10-liter gas and 8-liter diesel engines, in a two-pound box that costs about half what our top pick does. That is the A30's argument, and it is a strong one if the heaviest thing you own is a diesel tractor or a big-block pickup, because nothing else here covers an engine that size for anywhere near the money.

Two things to know before you order. Charging is the least dependable part of this pack — the failure that turns up is a unit that comes back to full one week and will not the next — so put it through a full discharge and recharge in the first month, while returning it is still simple. And treat the engine rating as the real number rather than the amp figure, since peak amps are quoted differently by every brand on this page. A 400-lumen light and QC 3.0 USB ports round out a package that is honest about what it is.

Same money as our top pick, and twice the amp number on the label, which is a good illustration of how loosely peak amps get quoted across brands. The MegaVolt24's real advantages sit elsewhere: an 88.8 watt-hour battery, a 65-watt USB-C port that refills the pack and can charge a laptop from the same brick, and a stated operating range of -4 to 140 degrees Fahrenheit.

It is 1.5 inches thick and three pounds, so it slides behind a seat back or into a door pocket. The LCD gives a percentage rather than bars, and a one-touch boost handles a battery too low for the clamps to engage on their own — the same idea as the ZEVZO's force-start, and the feature to look for if you have ever clipped a smart pack to a battery reading zero and gotten nothing back.

For a truck parked outside through a northern winter, this is the pack we reach for: temperature rating and reserve matter more at ten below than any amp number, and the included 65-watt charger means a refill is an hour at a kitchen outlet rather than an overnight on a laptop cable. Charge it on the first of every month and it will be there.

The DJS90 is built for a specific shopper: someone who wants a pack in every vehicle rather than one good pack in the truck. At about a pound, with a hard case and an LCD that shows remaining power, it is the one that gets bought three at a time — the car, the truck, and the kid's first sedan.

We like it for that job more than we like it as an only pack. Three thousand amps and an 18 amp-hour battery will start an 8-liter gas engine or a 6-liter diesel, and a half-ton gasser fires without drama, but a cold diesel tractor is outside what it is built for. What it does have is a real percentage readout, which matters more on a cheap pack than an expensive one, because you will actually check it.

The case is the other reason this one survives a trunk full of tie-downs and feed sacks. Charge it every few months whether it needs it or not, and treat the LCD as the feature you paid for rather than the gadget next to it.

The feature worth knowing about on the ET03 is the force-start function built into the clamps. Smart clamps work by reading voltage before they release power, which is exactly right until the battery in front of you reads zero — at that point a good pack can decide the connection is a mistake and refuse to help. Holding the override tells it you know what you are doing.

Around that, the numbers are strong for the size: 4,000 amps, a rating for 8-liter gas and 7-liter diesel, 74 watt-hours, and 1.4 pounds in a package seven and a half inches long. There is a 500-lumen light, an LCD readout, a carrying case in the box, and a two-year warranty that most of this group does not match.

Where we land: this is the lightest way here to get a 7-liter diesel rating, and the one that fits a saddlebag, a console, or a motorcycle pannier without a second thought. Charging is where it wobbles — a pack that comes back to full one week and stalls at three-quarters the next is the failure that shows up — so run one full cycle in the first month and keep an eye on the readout.

A 100 PSI compressor with a digital preset is the reason to buy this one. On a ranch, a low tire is a more common emergency than a flat battery — a trailer, a UTV, a wheelbarrow, a ball that needs air before the game — and the Bolt Air handles all of it from the same brick that jumps the car.

The jump side is the modest part: 500 amps peak and a 58.8 watt-hour battery, rated for cars and light SUVs rather than diesel trucks. Treat it as a car-kit item and it is fine; expect it to crank a cold Powerstroke and you will be disappointed.

The rest of the kit is thoughtful. A floodlight for a dark shoulder, USB charging for a phone, four nozzles and a 24-inch hose extension for the compressor, and both a wall adapter and a car charger in the box — which is more than several picks here manage.

Our take: it is the best pick here for a car, a UTV, or a horse trailer whose tires go soft more often than its battery goes flat, and it is the one to hand a teenager heading back to school three hours away. The 90-day warranty is the shortest of any pick here, and that is the part that gives us pause.