NOCO Boost HD GB70 2000A UltraSafe Lithium Jump Starter

The GB70 is the NOCO for people whose vehicles outgrow the GB40. NOCO rates it for gas engines up to 8.0 L and diesels up to 6.0 L, which takes in every half-ton and most three-quarter-ton pickups, big SUVs, gas motorhomes, tractors and the 6.0 L and 6.6 L diesels in older heavy-duty trucks. If your driveway has one of those, the 1,000 A GB40 is undersized on paper and the GB70 is the pack NOCO built for the job.

It also suits people who will use a jump starter as a shop or boat tool rather than a glovebox item. The 400-lumen light, the 12 V accessory port and the rubberized IP65 housing make sense on a dock or in a truck bed in a way they do not in a hatchback.

The starting margin is real. CarXplorer reports starting a 7.0 L V8 truck and a 6.0 L diesel SUV in cold weather with the GB70, and Jump Starter Hub started a 5.7 L V8 that had sat for two weeks in sub-freezing temperatures on the first try. Both note that the pack held up through repeated attempts. NOCO's own figure is up to 40 starts per charge from the 56 Wh battery, which is realistic only on small engines, but a handful of big-diesel starts per charge is what most owners actually need.

The safety design is the same UltraSafe layer as the GB40: the clamps do not pass current until the pack sees a correctly connected battery, so reversed clamps or clamps touching each other produce an error rather than a spark. The manual override, which forces output for a battery too flat to be detected, revived a battery reading under 2 V in CarXplorer's testing. That override is also the one feature that can bite a careless user, since it disables the polarity check, so read the guide before using it.

The 12 V XGC port sets the GB70 apart from the compact packs. It supplies 15 A for 12 V accessories such as an inflator and, with NOCO's optional 12 V charger, accepts a 3 A fast-charge input that CarXplorer clocked at roughly 3 hours to full. NOCO's spec page also lists a USB-C input, so current units no longer depend on micro-USB.

The housing is IP65 with the ports closed and survived drop testing in CarXplorer's review. Retailer spec sheets list CE, FCC, RoHS and UN 38.3 compliance, which is the documentation NOCO offers in place of a UL 2743 line.

Weight is the obvious cost. NOCO lists 4.18 lb for the unit; Jump Starter Hub and CarXplorer both weigh it at about 5 lb with clamps and cable. That is about twice the GB40 and the HULKMAN Alpha85, and it does not fit under most seats.

Recharging over USB is slow at 5 V 2.1 A, with reviewers quoting 6 to 8 hours. The faster 12 V XGC input needs NOCO's charger, which current retail listings show as a separate accessory even though some older bundles included wall and car chargers. Check the box contents on the listing you buy.

Clamps draw mixed comments. TechGearLab praises the thin-jaw NOCO clamp design in general, and Jump Starter Hub calls the GB70's heavy-duty copper clamps secure, but CarXplorer felt they were less robust than a 2,000 A rating implies, and Jump Starter Hub found the leads short on some hard-to-reach terminals. That is a fair caution on a truck with the battery at the back of the bay.

Finally, the pack is 12 V only. Owners of 24 V equipment need a different product.

The GOOLOO GT4000S is rated higher (12.0 L gas, 10.0 L diesel), has an IP65 housing of its own, a status screen and a 100 W USB-C input that refills it in about 1.2 hours. What it lacks is NOCO's long record in independent tests and a published weight. Choose the Gooloo for the biggest diesels and a fast recharge; choose the GB70 for NOCO's protection design in a tool that lives in a truck bed or on a boat.

The HULKMAN Alpha85 matches the GB70's rating (8.5 L gas, 6.0 L diesel), adds a status screen and a 65 W recharge in about 90 minutes, and weighs about half as much. What it lacks is NOCO's track record. If the recharge time and the screen matter, the Hulkman is the more modern design.

For small engines the NOCO Boost Plus GB40 does the same job at half the weight. Our full comparison and the engine-size guidance are in the best portable jump starters list.

Buy the GB70 if you have a V8 truck, a big SUV or a diesel up to 6.0 L and want NOCO's protection design in a sealed housing with a 12 V port. Skip it if you drive a small car, want a pack that recharges in an hour, or need to carry it in a jacket pocket.