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Short version: the NOCO GB70 Boost HD is the jump starter owners trust when they need a dead battery to fire on the first try. Owners consistently report that its 2,000 amps crank big V8 trucks and diesels without breaking a sweat, and that NOCO's spark-proof, reverse-polarity-protected design makes it genuinely idiot-proof to use — which is why it leads our best portable jump starter roundup. It is rated around 4.7 across tens of thousands of reviews. It is not the cheapest option, and the honest complaints below are worth knowing, but for dependable emergency starting power it is the benchmark.
What the NOCO GB70 Is
The GB70 is the high-output model in NOCO's Boost lithium jump-starter line, rated at 2,000 amps — enough for gas engines up to roughly 8 liters and diesels up to about 6 liters. The feature reviewers praise most is not the raw power but the safety system: spark-proof leads and reverse-polarity protection mean the unit refuses to deliver current until the clamps are connected correctly, so a nervous first-timer cannot fry their electronics.
Beyond jump starting, it doubles as a power bank for phones and tablets and packs a bright LED flashlight with SOS and strobe modes — the kind of roadside-kit extras owners mention appreciating when they are stranded in the dark. It is built into a rugged, water-resistant housing that reviewers repeatedly describe as feeling far more solid than the cheap plastic competition. This is the emergency tool you buy once and forget about — as long as you keep it charged.
Who It's For
If you drive a truck, SUV, diesel, boat or anything with a big engine, the GB70 is aimed squarely at you — owners with smaller V6 units in NOCO's line sometimes wish they had sized up for the extra headroom. It is also the pick for anyone who wants a genuinely foolproof tool to hand to a spouse or teenager, because the safety features remove the classic ways people damage a car jump starting it.
It is a poorer fit for someone on a tight budget who only drives a small four-cylinder — a lower-amp unit will do that job for less. And it is not a set-and-forget device: it needs periodic recharging. If you are still deciding what size you need, start with the Jump Starters hub, and see the portable jump starter roundup for how the GB70 stacks up against smaller and larger models.
What Owners Love
Across a large pool of reviews, the same themes recur:
- It just starts things. The top-cited win. Owners repeatedly report firing dead big-block trucks and diesels on the first attempt, often after cheaper units failed.
- Foolproof safety. Reviewers consistently praise the spark-proof, reverse-polarity-protected design — no sparks, no fried electronics, no anxiety about which clamp goes where.
- Build quality. The rugged, water-resistant housing and thick clamps draw steady praise; owners describe it as a tool that inspires confidence in a real emergency.
- Genuinely useful extras. The power-bank function and the bright multi-mode flashlight get repeated mentions as the features owners are glad to have when stranded.
Common Complaints
An honest read of the reviews turns up a consistent set of gripes:
- Slow micro-USB charging. The most common complaint. The GB70 charges over micro-USB, which is dated and slow, and some owners find the input port finicky. A quality charger and patience are the usual fix.
- It self-discharges if neglected. A recurring frustration is finding it flat in an emergency after months in a trunk. It holds charge acceptably, but owners stress topping it up every few months.
- Short, stiff clamp cables. Several owners wish the leads were longer and more flexible, especially reaching batteries buried deep in an engine bay or in the trunk.
- Price. It sits well above budget units. Owners who value the safety and build think it is worth it; bargain hunters do not.
- Occasional unit failures. A small number of owners report a unit that would not recharge or hold power. It is the exception across the review pool, and NOCO's warranty generally covers it, but it appears often enough to note.
Alternatives Worth a Look
The GB70 is our top pick, but depending on what you value:
- GOOLOO GP4000 — the value and raw-power alternative. Owners who want even higher peak amps and USB-C charging for less money gravitate here, accepting a less premium feel.
- NOCO GB40 — the smaller-car pick. Same safety features in a cheaper, lower-amp package that is plenty for four-cylinder and V6 engines.
- A larger GB150 / GBX155 — the heavy-diesel choice. Owners running big commercial diesels step up to NOCO's biggest units for the extra cranking margin.
For the full ranked comparison of all of these, see the best portable jump starter roundup, and browse the Jump Starters hub for battery chargers and maintainers to keep your battery healthy in the first place.
Recommended Options
Best for big V8 trucks, diesels and boats needing dependable starts
- 2,000A for gas up to ~8L and diesel up to ~6L
- Spark-proof, reverse-polarity-protected leads
- Doubles as a power bank with an LED flashlight
- Rugged, water-resistant housing owners trust
Why buy it: the unit we reviewed and the benchmark for reliable emergency starting — foolproof to use and built to last, as long as you keep it topped up.
Best for even higher peak amps and USB-C charging for less money
- 4,000A peak, gas engines up to ~10L
- USB-C in/out for faster charging than the GB70
- Large owner base at a lower price
- Power bank and light built in
Why buy it: the value-and-power alternative the review flags — more peak amps and modern charging for less, accepting a slightly less premium feel.
Best for four-cylinder and V6 engines that do not need 2,000 amps
- 1,000A, plenty for most cars and small SUVs
- Same NOCO spark-proof safety system
- One of the best-selling jump starters anywhere
- Cheaper and lighter than the GB70
Why buy it: the right-sized, cheaper NOCO for smaller engines — the same idiot-proof safety in a lower-amp package you will never overtax on a commuter.
Best for big commercial diesels wanting extra cranking margin
- 3,000A for the largest gas and diesel engines
- Heavy-duty clamps and longer leads
- Same NOCO safety and build reputation
- Headroom the GB70 cannot match
Why buy it: the step-up for the biggest engines — NOCO’s high-output unit when a 2,000A GB70 is not quite enough margin for a large diesel.
Best for GB70-level power with a screen and faster recharge
- 2,000A peak with a smart status display
- Fast USB-C recharge, unlike the GB70’s micro-USB
- High owner rating across thousands of reviews
- Bright light and power-bank output
Why buy it: the modern challenger — matches the GB70’s cranking power and fixes its slow-charging gripe, with an on-unit display, for less money.
Prices are pulled from Amazon and were accurate as of Aug 22, 2026, 7:14 PM EDT. Product prices and availability are subject to change — the live price is shown on Amazon.
The Verdict
The NOCO GB70 earns the trust owners place in it. Reviewers consistently report that its 2,000 amps fire big gas and diesel engines on the first try, that the spark-proof safety system makes it genuinely foolproof, and that the rugged build and useful extras make it the roadside tool you are glad to have. The honest trade-offs are real: the micro-USB charging is slow, it needs topping up every few months or it will let you down when you need it, and it costs more than budget units. Keep it charged and accept the price, and you get one of the most dependable jump starters money can buy — which its ~4.7 rating across tens of thousands of reviews confirms.