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 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 step up from the GB70 when you are starting a big diesel — NOCO rates it 4000A against the GB70's 2000A.

The high-amp budget option: 4000A peak rated for all gas engines and diesels up to 10.0L, with SuperSafe clamp protection and a big enough cell to work as a dual-USB power bank. Note this is the GP model — GOOLOO's pricier GT4000S is the one with 100W two-way USB-C, which this does not have.

The headroom option for big trucks and diesels: AVAPOW rates the A68 at 6000A peak and up to a 12L diesel, with an eight-layer clamp protection system and indicator lights that make a wrong connection hard to complete. It also works as a dual-USB power bank with a 3-mode LED light. Overkill for a commuter car, right-sized if you regularly start large diesel powerplants.