Head-to-head comparison · Jump Starters
NOCO GBX45 vs GB40
Two small NOCO starters for cars and half-ton trucks. The newer Boost X GBX45 adds 250 amps, larger engine ratings and 60 W USB-C charging.
By Watt Versus Editorial· Updated
This page was drafted with AI assistance from manufacturers' specs and manuals, and is checked by our editor.
Why the NOCO Boost X GBX45 Jump Starter wins
The GBX45 covers gasoline engines up to 6.5 L and diesels up to 4.0 L, against 6.0 L and 3.0 L, recharges in about 0.8 hours over 60 W USB-C and weighs 2.16 lb. The GB40 is the pick only if you specifically want NOCO's published 20 jump starts per charge.
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NOCO Boost X GBX45 Jump Starter
A 1,250-amp lithium jump starter for gasoline engines up to 6.5 L and diesel engines up to 4.0 L, with 60 W USB-C charging in and out.
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
| Specification | NOCO Boost X GBX45 Jump StarterOur pick | NOCO Boost Plus GB40 Jump Starter |
|---|---|---|
| Editorial score | Editorial score:8.3/10 | Editorial score:8.2/10 |
| Best for | Best Small Starter with USB-C Charging | — |
| Peak current | 1,250 A | 1,000 A |
| Gas engines | Up to 6.5 L | Up to 6.0 L |
| Diesel engines | Up to 4.0 L | Up to 3.0 L |
| Battery capacity | 31 Wh | — |
| USB output | USB-A 5 V, 2.1 A (10 W); USB-C up to 20 V, 3 A (60 W) | 5 V, 2.1 A |
| Recharge time | 0.8 hours at 60 W over USB-C; 4 hours at 10 W | 3 hours at 2 A, 6 hours at 1 A |
| Flashlight | 100 lumens | 100 lumens, 7 modes |
| Water and dust rating | IP65 with ports closed | IP65 with ports closed |
| Weight | 2.16 lb (0.98 kg) | 2.4 lb |
| Warranty | 1 year | 1 year |
| Jump starts per charge | — | Up to 20 |
| Dimensions | — | 6.7 x 3.2 x 1.7 in |
| Where to buy | Check Latest Price on Amazon (paid link) | Check Latest Price on Amazon (paid link) |
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At a glance
Key differences
- 1Peak current: 1,250 A for the GBX45, 1,000 A for the GB40
- 2Gas engines: up to 6.5 L against 6.0 L
- 3Diesel engines: up to 4.0 L against 3.0 L
- 4Recharge: about 0.8 hours at 60 W USB-C against 3 hours at 2 A
- 5Weight: 2.16 lb against 2.4 lb
Product by product
Pros and cons
NOCO Boost X GBX45 Jump Starter
The best small NOCO for a car, crossover or half-ton truck if you charge everything over USB-C. Owners of big diesels should look at the GB70 or GB150.
Pros
- Covers gasoline engines up to 6.5 L and diesels up to 4.0 L, a step above the Boost Plus GB40
- Recharges in about 0.8 hours from a 60 W USB-C charger, by NOCO's figures
- USB-C port also charges phones and laptops at up to 60 W
- IP65 housing at 2.16 lb
Cons
- No 12 V accessory output, so it cannot run a tire inflator
- NOCO does not publish a jump-starts-per-charge figure for this model
- Works with 12-volt lead-acid batteries only
- A 1-year warranty is short for this category
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
Choose the NOCO GBX45 if
- You charge your devices over USB-C and want the starter to share the charger.
- Your diesel is between 3.0 and 4.0 L.
Choose the NOCO GB40 if
- You want the published figure of up to 20 jump starts per charge.
Neither has a 12 V accessory output; for that, step up to the GB70.
Frequently asked questions
- What is the difference between the NOCO GBX45 and GB40?
- The GBX45 has 1,250 A against 1,000 A, covers gasoline engines up to 6.5 L and diesels up to 4.0 L against 6.0 L and 3.0 L, and recharges over 60 W USB-C in about 0.8 hours.
- Which is lighter?
- The GBX45, at 2.16 lb against 2.4 lb for the GB40, by NOCO's figures.
- Can either run a tire inflator?
- No. Neither has a 12 V accessory output; the GB70 and GB150 do.
Sources
The specifications and claims on this page come from these manufacturer documents. Figures are the manufacturers' own unless the text says otherwise.
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