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Head-to-head comparison · Jump Starters

NOCO GB20 vs GB40

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.

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This page was drafted with AI assistance from manufacturers' specs and manuals, and is checked by our editor.

Our pick: NOCO Boost Plus GB40 Jump Starter

Why the NOCO Boost Plus GB40 Jump Starter wins

For a car, buy the GB40: it covers most gasoline cars, crossovers and half-ton trucks, adds small diesels and costs less than 1 lb of extra weight.

Prices change often. Check the current price and availability on Amazon.

Check Latest Price on Amazon (paid link)
Image: NOCONOCO Boost Sport GB20 Jump Starter
Editorial score:7.6/10

NOCO Boost Sport GB20 Jump Starter

A 500-amp, 1.65 lb lithium jump starter for gasoline engines up to 4.0 L, motorcycles, ATVs and lawn equipment.

Image: NOCONOCO Boost Plus GB40 Jump Starter
Editorial score:8.2/10Our pick

NOCO Boost Plus GB40 Jump Starter

A 1,000-amp lithium jump starter rated for gasoline engines up to 6.0 L and diesel engines up to 3.0 L.

Side-by-side

Specs compared

SpecificationNOCO Boost Sport GB20 Jump StarterNOCO Boost Plus GB40 Jump StarterOur pick
Editorial scoreEditorial score:7.6/10Editorial score:8.2/10
Best forBest for Small Cars—
Peak current500 A1,000 A
Gas enginesUp to 4.0 LUp to 6.0 L
Diesel enginesNot rated for dieselUp to 3.0 L
Battery capacity24 Wh—
Jump starts per chargeUp to 20Up to 20
USB output5 V, 2.1 A5 V, 2.1 A
Recharge time3 hours at 2 A, 6 hours at 1 A3 hours at 2 A, 6 hours at 1 A
Flashlight100 lumens, 7 modes100 lumens, 7 modes
Water and dust ratingIP65 with ports closedIP65 with ports closed
Weight1.65 lb (2.1 lb with clamps and accessories)2.4 lb
Dimensions—6.7 x 3.2 x 1.7 in
Warranty—1 year
Where to buyCheck Latest Price on Amazon (paid link)Check Latest Price on Amazon (paid link)

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At a glance

Key differences

  1. 1Peak current: 1,000 A against 500 A.
  2. 2Gas engines: up to 6.0 L against 4.0 L.
  3. 3Diesel engines: up to 3.0 L for the GB40; the GB20 is not rated for diesel.
  4. 4Flashlight: both 100 lumens with 7 modes.
  5. 5Weight: 2.4 lb against 1.65 lb.

Product by product

Pros and cons

Best for Small CarsModel GB20

NOCO Boost Sport GB20 Jump Starter

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

  • 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
Check Latest Price on Amazon (paid link)Full review
Model GB40

NOCO Boost Plus GB40 Jump Starter

The sensible default for a gasoline car or SUV. Diesel truck owners should step up to the GB70.

Pros

  • Covers most cars, crossovers and half-ton trucks with gasoline engines up to 6.0 L
  • Spark-proof clamps and reverse-polarity protection
  • IP65 housing and a compact 2.4 lb body
  • Up to 20 jump starts per charge, by NOCO's figures

Cons

  • Diesel rating stops at 3.0 L, too small for most diesel pickups
  • A 1-year warranty is short for this category
  • Works with 12-volt lead-acid batteries only
Check Latest Price on Amazon (paid link)Full review

Choose the NOCO GB40 if

  • You drive a car, crossover or light truck up to 6.0 L.
  • You live where winters are cold: the extra current helps.

Choose the NOCO GB20 if

  • You need it for a motorcycle, ATV or lawn tractor.
  • Your car has a small engine and you want the smallest possible unit.

Both

Spark-proof clamps, reverse-polarity protection, an IP65 housing with ports closed, and USB output for a phone.

Frequently asked questions

What is the difference between the NOCO GB20 and GB40?
The GB40 has 1,000 A against 500 A and covers gasoline engines up to 6.0 L and diesels up to 3.0 L. The GB20 covers gasoline engines up to 4.0 L and no diesels.
Is the NOCO GB20 enough for a car?
For gasoline engines up to 4.0 L, by NOCO's rating. Close to that limit, or in cold weather, the GB40 is the safer choice.
How many jump starts per charge?
Up to 20 for both, according to NOCO.

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