NOCO Boost Sport GB20 Jump Starter Review
A 500-amp, 1.65 lb lithium jump starter for gasoline engines up to 4.0 L, motorcycles, ATVs and lawn equipment.
By Watt Versus Editorial· Updated
This page was drafted with AI assistance from manufacturers' specs and manuals, and is checked by our editor.
Our verdict
A tiny starter for compact cars, motorcycles and yard equipment. If your engine is close to 4.0 L, or you live where winters are hard, buy the GB40 instead.
Pros and cons
Pros
- 1.65 lb: fits a glovebox, a motorcycle bag or a mower shed shelf
- Covers gasoline engines up to 4.0 L, which includes most four-cylinder cars
- Spark-proof clamps and reverse-polarity protection
- Recharges in about 3 hours from a 2 A USB charger
Cons
- Not rated for diesel engines at all
- 500 A leaves little margin for a large engine on a cold morning
- Works with 12-volt lead-acid batteries only
Specifications
| Peak current | 500 A |
|---|---|
| Gas engines | Up to 4.0 L |
| Diesel engines | Not rated for diesel |
| Battery capacity | 24 Wh |
| Jump starts per charge | Up to 20 |
| USB output | 5 V, 2.1 A |
| Recharge time | 3 hours at 2 A, 6 hours at 1 A |
| Flashlight | 100 lumens, 7 modes |
| Water and dust rating | IP65 with ports closed |
| Weight | 1.65 lb (2.1 lb with clamps and accessories) |
The full review
Who it suits
Owners of compact cars, motorcycles, ATVs and lawn tractors who want a starter small enough to forget about until it is needed.
Who should skip it
Anyone with a diesel engine, a V8 or a gasoline engine above 4.0 L. Cold weather makes engines harder to crank, so drivers in cold climates should choose a model rated well above their engine size.
What we could not confirm
NOCO's data sheet does not state the warranty term or the unit's outer dimensions, so both are left out.
Frequently asked questions
- What engines can the NOCO GB20 start?
- NOCO rates it for gasoline engines up to 4.0 liters. It is not rated for diesel engines.
- How many jump starts does the GB20 give per charge?
- Up to 20, according to NOCO.
- How long does the GB20 take to recharge?
- About 3 hours at 2 A, 6 hours at 1 A, or 12 hours at 0.5 A, per NOCO's data sheet.
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VS comparison
NOCO Boost Sport GB20 Jump Starter vs NOCO Boost Plus GB40 Jump Starter
The GB20 is the smallest NOCO starter, for gasoline engines up to 4.0 L. The GB40 doubles the current and covers gasoline engines up to 6.0 L and small diesels.
Updated October 15, 2026
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Best NOCO Jump Starters by Engine Size
NOCO makes the Boost range in sizes for every engine. Here is which one to buy for a motorcycle, a car, a V8 truck or a heavy-duty diesel.
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