Best Portable Jump Starters
Lithium jump starters that actually crank a dead battery — sized by real amps, not marketing amps.
The value pick for people who want the pack to double as a laptop/phone bank: 2000A of starting power — the same class as the GB70 — plus 65W USB-C PD that charges in and out. The 3.3-inch screen reports exact charge and fault state rather than making you guess at LED bars.
The unit we'd hand a stranger without instructions: 2000A of spark-proof, reverse-polarity-protected output that starts big gas and diesel engines, backed by 30,000+ owner ratings. You pay for the safety engineering and the amp headroom — the smaller GB40 below is the same safety system for half the money if your engine doesn't need 2000A.
The step up from the GB70 when you are starting a big diesel — NOCO rates it 4000A against the GB70's 2000A.
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Best Overall is an editorial pick, chosen for the job most buyers in this category are actually doing. DriveScore is a published supporting signal, not the tiebreaker — a cheaper, narrower product can out-score the pick and still be the wrong buy. How we rank.
What matters most to you?
Best overall is our editorial pick; the rest are derived from the published sub-scores.
Our editorial pick — the best fit for what most buyers in this category need. The unit we'd hand a stranger without instructions: 2000A of spark-proof, reverse-polarity-protected output that starts big gas and diesel engines, backed by 30,000+ owner ratings. You pay for the safety engineering and the amp headroom — the smaller GB40 below is the same safety system for half the money if your engine doesn't need 2000A.
All 6, ranked — deltas vs. the winner
EDITORIAL RANK · DRIVESCORE SHOWN
How to actually pick one
The number on the box is almost always 'peak amps,' a meaningless instantaneous spec. What starts your car is sustained cranking current, which reputable brands rarely print. For a 4-cylinder, a 400–800A-class pack is plenty; for a V6/V8, step up to 1000A+; for a diesel, buy a unit that explicitly lists diesel displacement support. Prioritize spark-proof, reverse-polarity-protected clamps — the safety electronics are where cheap units cut corners. Capacity (mAh) matters mostly for how many starts per charge and USB-C PD output for phones/laptops. Store it charged; lithium packs self-discharge and a dead jump starter is useless in an emergency.