NOCO Boost GBX55 Review: Pros, Cons and Who It Suits

NOCO Boost GBX55 review: the short verdict

The GBX55 is a portable lithium jump starter in NOCO’s Boost family, rated at 1,750 peak amps. The pitch is simple: a 3.4 lb box that starts gas engines up to 7.5L and diesels up to 5.0L, then recharges over USB-C and doubles as a 60-watt power bank for phones, tablets and laptops.

The appeal is the combination of output and recharge speed. A 1.2-hour recharge over USB-C Power Delivery, or 5 minutes for enough charge for one jump start, keeps the unit ready between jobs. The limits are just as clear. The 5.0L diesel ceiling rules out bigger oil-burners, the 60-second timer caps each cranking attempt, and the listing states a 1-year warranty with no third-party certification named.

Key specs

Specifications are manufacturer rated, as published on the Amazon listing and collected 19 October 2026.

The GBX55

What the GBX55 does well

1,750 amps for big gas and moderate diesel engines

The headline figure is 1,750 peak amps, rated for gas engines up to 7.5L and diesel up to 5.0L. That covers most cars, SUVs, trucks, motorcycles, ATVs, RVs and boats the listing names. For a fleet of half-ton trucks and family SUVs, verify each engine against those limits before buying.

Recharges fast, then works as a 60W power bank

The listing claims a full recharge in 1.2 hours over USB-C Power Delivery, and 5 minutes on the charger for enough power for one jump start, even from a depleted unit. The 60-watt USB-C port charges phones, tablets and laptops, and dual-direction charging means the GBX55 works as a high-output portable power bank between jumps.

UltraSafe 2.0 protection on the clamps

NOCO’s UltraSafe 2.0 is described as spark-proof with reverse polarity protection, plus improved thermal efficiency and power management. For a tool that gets loaned to family members, protection against reversed clamps is worth more than extra amps.

Small enough to live in the vehicle

At 3.4 lb and 6.34 by 3.94 by 9.13 inches, the GBX55 is easy to keep in the vehicle year-round. A jump starter only helps if it is there when the battery dies.

What 3150 mAh actually powers

The spec table lists a 3150 mAh battery capacity behind the 1,750 peak amps. That capacity funds the up-to-9 jump starts per charge the listing claims, with the 60-second timer rationing each attempt so one long crank does not drain the pack. As a power bank, the same capacity feeds the 60-watt USB-C port for phones, tablets and laptops, though a laptop will drink it faster than a phone. Dual-direction charging means the USB-C port both refills the GBX55 and draws from it. One practical note from the listing: 5 minutes on the charger buys enough for a single jump start even from a fully depleted unit, so a forgotten charge is a five-minute problem, not a dead tool.

A 200-lumen light with 7 modes

The integrated LED flashlight is rated at 200 lumens with 7 modes, including SOS and strobe. Jump starts happen in dark parking lots, and a built-in light beats holding a phone in your teeth. The SOS and strobe modes turn the jump starter into a roadside signal if the car dies somewhere dark.

Limitations

• Diesel ceiling. The 5.0L diesel rating covers many pickups but not the big ones. If your truck runs a larger diesel, the listing’s own numbers say to look higher in the range.
• 60-second timer. Each start attempt is capped at 60 seconds by the integrated timer, which conserves the high-voltage design’s energy. A stubborn engine that needs long cranking will hit that wall.
• Warranty and certification. The listing states a 1-year warranty and names no third-party certification. Our Shop Score gives no safety points beyond the stated protection features, which is why the GBX55 scores below what its reputation might suggest.
• Vague spec line. The spec table lists “Specification Met: energy”, which says nothing useful. Treat it as filler, not a credential.
• Single unit. The box holds one GBX55, one set of heavy-duty clamps, one USB-C cable and a storage bag. A two-car household that wants one in each vehicle buys twice.

How we scored it

Shop Score weighs performance, build, value, safety and warranty. Full method on our how we pick page.

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

Who should buy the NOCO Boost GBX55, and who should skip it

Alternatives

• Supercapacitor jump starter: no internal battery to keep charged, but different trade-offs. See our supercapacitor vs lithium jump starter comparison.
• Fleet-duty jump starter: for work trucks and equipment, the best jump starter for fleet vehicles roundup covers higher-output options.
• Battery maintainer: if the real problem is a vehicle that sits, a maintainer beats a jump starter. See the best battery maintainer for classic cars.

Whatever jump starter you use: read the manual before the first jump, keep the clamps from touching each other, and store the unit charged. The GBX55’s listing advertises spark-proof and reverse-polarity protection, which guards against two classic clamp mistakes, but it does not replace reading the manual.

Frequently Asked Questions

What engines can the NOCO Boost GBX55 start?

The listing rates it for gas engines up to 7.5L and diesel engines up to 5.0L, at 1,750 peak amps. It names cars, trucks, motorcycles, SUVs, boats, ATVs and RVs as compatible. Check your engine size against those limits before buying.

How many jump starts do you get per charge?

The listing claims up to 9 jump starts per charge, with a 60-second timer on each attempt to conserve energy. Real counts depend on the engine and how long each crank runs.

How long does the GBX55 take to recharge?

The listing states 1.2 hours for a full recharge over USB-C Power Delivery, and 5 minutes on the charger for enough power for a single jump start, even from a fully depleted unit.

Can the GBX55 charge a phone or laptop?

Yes, per the listing. The 60-watt USB-C Power Delivery port charges phones, tablets, laptops and more, and dual-direction charging lets the GBX55 serve as a portable power bank.

Is the GBX55 spark-proof?

The listing describes UltraSafe 2.0 as spark-proof with reverse polarity protection, plus enhanced thermal efficiency and power management. Those are the maker’s claims, stated on the listing.

What comes in the box?

The listing names the GBX55 jump starter, heavy-duty clamps, a USB-C charging cable and a microfiber storage bag. The unit is backed by a 1-year warranty.

Related: the best jump starters for fleet vehicles, the supercapacitor vs lithium jump starter comparison, our battery maintainer picks and the diagnostics and electrical hub.