Head-to-head comparison · Jump Starters
NOCO GBX55 vs GBX45
Two Boost X starters with the same 60 W USB-C charging. The GBX55 adds 500 amps, larger engine ratings and a bigger battery for 0.42 lb more.
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 GBX55 Jump Starter wins
The GBX55 covers gasoline engines up to 7.5 L and diesels up to 5.0 L, against 6.5 L and 4.0 L, with a 46 Wh battery against 31 Wh. That margin matters for V8s, small diesels and cold mornings. The GBX45 is enough for four- and six-cylinder cars and is lighter.
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NOCO Boost X GBX55 Jump Starter
A 1,750-amp lithium jump starter for gasoline engines up to 7.5 L and diesels up to 5.0 L, with 60 W USB-C charging in and out.
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.
Side-by-side
Specs compared
| Specification | NOCO Boost X GBX55 Jump StarterOur pick | NOCO Boost X GBX45 Jump Starter |
|---|---|---|
| Editorial score | Editorial score:8.4/10 | Editorial score:8.3/10 |
| Best for | Best All-Round Boost X | Best Small Starter with USB-C Charging |
| Peak current | 1,750 A | 1,250 A |
| Gas engines | Up to 7.5 L | Up to 6.5 L |
| Diesel engines | Up to 5.0 L | Up to 4.0 L |
| Battery capacity | 46 Wh | 31 Wh |
| USB output | USB-A 5 V, 2.1 A (10 W); USB-C up to 20 V, 3 A (60 W) | USB-A 5 V, 2.1 A (10 W); USB-C up to 20 V, 3 A (60 W) |
| Recharge time | 1.2 hours at 60 W over USB-C; 7.2 hours at 10 W | 0.8 hours at 60 W over USB-C; 4 hours at 10 W |
| Flashlight | 200 lumens | 100 lumens |
| Water and dust rating | IP65 with ports closed | IP65 with ports closed |
| Weight | 2.58 lb (1.17 kg) | 2.16 lb (0.98 kg) |
| Dimensions | 7.7 x 4.9 x 2.5 in | — |
| Warranty | 1 year | 1 year |
| 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: 1,750 A for the GBX55, 1,250 A for the GBX45
- 2Gas engines: up to 7.5 L against 6.5 L
- 3Diesel engines: up to 5.0 L against 4.0 L
- 4Battery: 46 Wh against 31 Wh
- 5Weight: 2.58 lb against 2.16 lb
Product by product
Pros and cons
NOCO Boost X GBX55 Jump Starter
The Boost X size that fits most garages: gasoline engines up to 7.5 L and diesels up to 5.0 L in a 2.58 lb pack that recharges over USB-C. Smaller cars can save weight with the GBX45; diesel pickups should step up to the GBX75 or GB150.
Pros
- Covers gasoline engines up to 7.5 L and diesels up to 5.0 L, a step above the GBX45
- Full recharge in 1.2 hours from a 60 W USB-C charger, by NOCO's figures
- The USB-C port also charges phones and laptops at up to 60 W
- IP65 housing at 2.58 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 the Boost X range
- A 1-year warranty is short for this category
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
Choose the NOCO GBX55 if
- Your gasoline engine is between 6.5 and 7.5 L, or your diesel is between 4.0 and 5.0 L.
- You start vehicles in cold weather and want a size up from the minimum.
- You want a 200-lumen flashlight rather than 100 lumens.
Choose the NOCO GBX45 if
- You drive a car or crossover with a four- or six-cylinder engine.
- You want the lightest Boost X, at 2.16 lb, and the fastest recharge, about 0.8 hours at 60 W.
Neither has a 12 V accessory output. For bigger trucks, see the GBX75.
Frequently asked questions
- What is the difference between the NOCO GBX55 and GBX45?
- The GBX55 has 1,750 A against 1,250 A, covers gasoline engines up to 7.5 L and diesels up to 5.0 L against 6.5 L and 4.0 L, and has a 46 Wh battery against 31 Wh.
- Which recharges faster?
- The GBX45, in about 0.8 hours at 60 W against 1.2 hours for the GBX55, by NOCO's figures.
- Do they charge phones?
- Yes. Both have a USB-C port that delivers up to 60 W and a 10 W USB-A port.
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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