Car Jump Starters
every brand-name jump starter we track, one row each, from 1-lb glovebox packs to 18-lb shop boxes. filter by battery type first, then sort by the diesel or gas engine column to find the ones rated for your engine. peak amps is the maker's own burst claim with no standard test behind it, so treat it as a ceiling and lean on the engine ratings and watt-hours instead.
 AstroAI S8 1500A Jump Starter | 5.9 Very small and cheap, but GearLab scored it near the bottom for short cables, slow recharge and little power-bank capacity, with durability complaints. | Lithium-ion | 1,500 A | 6 L | 3 L | 37 Wh AstroAI's figure (10,000 mAh). The Amazon spec table lists 8,000 mAh. | 0.9 lb | |
|---|---|---|---|---|---|---|---|---|
 Clore Automotive Booster PAC ES5000 1500 Peak Amp 12V Jump Starter | 6.2 Pro-grade clamps and cables, but it's heavy, has no USB or pump, and Clore doesn't even publish its capacity. | Sealed lead-acid | 1,500 A | – Clore doesn't rate it by engine size. It lists 400 cranking amps. | – Clore doesn't rate it by engine size. | – Clore doesn't publish a capacity for the ES5000. | 18 lb | |
 Clore Automotive Jump-N-Carry JNC660 1700 Peak Amp 12V Jump Starter | 6.9 The shop and tow-truck standard for its long heavy cables and sustained cranking, but far too heavy for a car and it self-discharges faster than lithium. | Sealed lead-acid | 1,700 A | – Clore doesn't rate it by engine size. It lists 425 cranking amps. | – Clore doesn't rate it by engine size. | 264 Wh 22 Ah at 12 V, per the Amazon listing. | 18 lb | |
 GOOLOO A3 3000A Jump Starter with Air Compressor | 6.7 One box for jumping and inflating, but the pump is slow and owners report units that quit charging after a few months. | Lithium-ion | 3,000 A | 9 L | 6.5 L | 44.4 Wh 12,000 mAh at 3.7 V. | 2.2 lb About 1 kg, as weighed in Nikktech's review. GOOLOO doesn't publish a weight. | |
 GOOLOO GP4000 4000A Jump Starter | 6.5 Lots of rated power in a light package, but no lab testing, no wall charger in the box and mixed reports on long-term battery health. | Lithium-ion | 4,000 A | – GOOLOO rates it for all gasoline engines without giving a size. | 10 L | 99.2 Wh Per the GP4000 manual. The current Amazon listing says 88.8 Wh. | 1.8 lb | |
 GOOLOO GT4000S 4000A Jump Starter | 7.6 Huge power for its price with a 100 W USB-C port; Outdoor Life's diesel pick, though some owners report units that stop charging. | Lithium-ion | 4,000 A | 12 L | 10 L | 88.8 Wh GOOLOO's figure (24,000 mAh). Other listings for this model range from 74 to 99.2 Wh. | 2.2 lb About 1 kg, as weighed in Nikktech's review. GOOLOO doesn't publish a weight. | |
 Hulkman Alpha 85 2000A Smart Jump Starter | 8.7 The most consistently praised pack here: fast 90-minute recharge, real IP65 sealing, few reliability complaints, and Outdoor Life's best overall. | Lithium-ion | 2,000 A | 8.5 L | 6 L | 74 Wh | 2.6 lb Unit only, per Hulkman. | |
 NOCO Boost HD GB70 2000A Jump Starter | 7.7 A sturdy, well-liked step up from the GB40 with room for V8s, though its recharge is slow and its cables are short. | Lithium-ion | 2,000 A | 8 L | 6 L | 56 Wh | 4 lb Unit alone, per NOCO's data sheet. 5.0 lb with clamps. | |
 NOCO Boost Plus GB40 1000A Jump Starter | 7.9 The category default: tough, waterproof and proven over years of sales, held back by a small battery, short cables and a generous engine claim. | Lithium-ion | 1,000 A | 6 L NOCO's rating. AutoGuide calls it optimistic and suggests a bigger unit above a 3.5 L V6. | 3 L | 24 Wh | 1.7 lb Unit alone, per NOCO's data sheet. 2.4 lb with clamps and accessories. | |
 NOCO Boost Pro GB150 3000A Jump Starter | 7.1 The most stored starts of any NOCO plus a voltmeter, but it's heavy, slow to recharge and expensive for what it adds. | Lithium-ion | 3,000 A | 9 L | 7 L | 88 Wh NOCO's data sheet says 88 Wh; its battery test summary says 89 Wh. | 6 lb Unit alone, per NOCO's data sheet. 7.5 lb with clamps. | |
 NOCO Boost X GBX155 4250A Jump Starter | 8.0 Scored highest in GearLab's tests and handles big diesels, but owners report more charge-holding failures than NOCO's older Boost line. | Lithium-ion | 4,250 A | 10 L | 8 L | 99 Wh | 5.8 lb Per NOCO's data sheet, likely without clamps. | |
 NOCO Boost X GBX45 1250A Jump Starter | 7.3 Tiny and refills over USB-C in under an hour, but it stores only a handful of starts per charge. | Lithium-ion | 1,250 A | 6.5 L | 4 L | 31 Wh | 1.3 lb Per NOCO's data sheet, likely without clamps. | |
 NOCO Boost X GBX75 2500A Jump Starter | 6.1 The least-reviewed NOCO here with no independent testing and the same charge-holding complaints as the rest of the Boost X line. | Lithium-ion | 2,500 A | 8.5 L | 6.5 L | 74 Wh | 3.8 lb Per NOCO's user guide, likely without clamps. | |
 NOCO Boost XL GB50 1500A Jump Starter | 6.9 A sensible middle NOCO with no independent testing to back it, and it costs close to the more capable GB70. | Lithium-ion | 1,500 A | 7 L | 4.5 L | 35 Wh From a retailer spec table. We found no NOCO document stating the GB50's watt-hours. | 3 lb Per NOCO's user guide. | |
 Schumacher Electric Schumacher SJ1332 1200 Peak Amp Jump Starter and Portable Power Station | 5.4 AC outlets and two inflation modes make it versatile, but its gauge tested about 8 PSI off and owner reports of early failure are frequent. | Sealed lead-acid | 1,200 A | 8 L | 6 L | 144 Wh 12 Ah at 12 V, per the Amazon listing. Schumacher's own page gives no capacity. | 18 lb | |
 STANLEY J5C09 1000 Peak Amp Jump Starter with Air Compressor | 5.2 Bob Vila's fastest tire filler, yet GearLab ranked it last overall; it's heavy and needs recharging every month to stay ready. | Sealed lead-acid | 1,000 A | – STANLEY doesn't rate it by engine size. It lists 500 instant amps. | – STANLEY doesn't rate it by engine size. | 228 Wh 19 Ah at 12 V, per STANLEY's spec sheet. | 17.2 lb | |
 TOPDON JumpSurge 3000 3000A Jump Starter | 7.4 Held strong current for seconds on Mighty Gadget's load tester and copes with cold, but the bundled charger is slow and durability reports are mixed. | Lithium-ion | 3,000 A | 9 L | 7 L | 88.8 Wh | 2.6 lb About 1.2 kg, per Mighty Gadget's review. TOPDON doesn't publish a weight. | |
 WOLFBOX MegaVolt24 4000A Jump Starter | 8.6 GearLab measured 93% of its claimed capacity and three easy dead-battery starts; big-engine ratings at a mid-range price make it the value standout. | Lithium-ion | 4,000 A WOLFBOX lists 1,000 A of starting current. | 10 L | 10 L | 88.8 Wh | 3.4 lb Per WOLFBOX's user guide. | |
 WOLFBOX MegaVolt24 Air 4000A Jump Starter with Air Compressor | 8.1 The MegaVolt24's battery plus a quick pump that Popular Science leaned on in a real 0°F emergency; bulkier, and some units reportedly die within a year. | Lithium-ion | 4,000 A WOLFBOX lists 1,000 A of starting current. | 10 L | 10 L | 88.8 Wh | 3.4 lb Per WOLFBOX's user guide. |
How the AI score works, and who wrote it
A language model rated these, not a test lab. Every score from 1 to 10 is an AI assessment of how good the product is against the other 19 in this comparison, formed from the specifications we verified plus the published lab reviews and owner reception found while researching each one. Nobody at Slopsheets listened to, wore or plugged in any of it.
It weighs the things a spec table cannot show: how a product is actually reviewed, how well the software works, build quality, and what you get for the money. That is deliberate. An earlier version of this column was pure arithmetic on the table and it ranked a bundle of cheap boxes above a class-leading single unit, because counting hardware is not the same as judging it.
Treat it as an informed starting point and read the sourced comparison, not as a verdict. The score is relative to this comparison only, so it means nothing across categories, and it carries no price, star rating or review count. Every specification behind it is sourced and checked; the score on top of them is opinion.
Frequently asked questions
Why are some engine-size cells blank?
Clore and STANLEY don't rate their lead-acid boxes by engine size at all, they list cranking or instant amps instead, which we put in the cell notes. GOOLOO rates the GP4000 for all gasoline engines without giving a number. We leave a cell blank rather than guess.
How is battery capacity worked out for the lead-acid units?
Lead-acid makers quote amp-hours, so we multiply by 12 volts: a 22 Ah battery is 264 Wh. Lithium makers usually quote watt-hours directly, or milliamp-hours at 3.7 volts, which we convert the same way. Where sources disagree, the cell note says so.
What does the weight column measure?
The unit itself as the maker lists it, without the case, charger or accessories where we could tell the difference. NOCO's older Boost line publishes both figures, and the with-clamps weight is in each cell note.
Why isn't there a cranking amps column?
Most lithium makers don't publish a sustained cranking figure, so there's nothing to compare across the whole field. Where a maker does list one, such as WOLFBOX's 1,000 starting amps or Clore's 425 cranking amps, it's in the cell note.
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