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NOCO Boost X GBX155 4250A Jump Starter
99Whstored energy
Output pendingcontinuous output
Verified internal spec page
Verified Product Page in Jump Starter NOCO

NOCO Boost X GBX155 4250A Jump Starter Review & Specs

Verified specifications, runtime planning, compatibility and buying options for this exact model.

Jump Starter Lithium-ion 99Wh Capacity Large 12V gasoline engines up to 10.0L…
Battery Lithium-ion
Capacity 99Wh
Output Pending verification
Weight 5.82 lb
Best for

Large 12V gasoline engines up to 10.0L and diesel engines up to 8.0L

Research status

Current record status: Current.

Buying status Exact Amazon Match
Check Price on Amazon ↗ Add to Compare Review Methodology
Exact Amazon MatchCommerce routing follows the locked Amazon-only rule.
1 compatibility linksMapped expansion, accessory, or adjacent-system relationships.
How We VerifiedManufacturer-sourced specs plus internal normalization and evidence checks.

Best Battery Backups Spec Sheet

Battery ChemistryLithium-ion
Capacity99 Wh
Weight5.82 lb
StatusCurrent

Runtime Estimates (99Wh)

Wi-Fi Router (10W) ~8.4 hrs
Laptop (60W) ~1.4 hrs
CPAP Machine (40W) ~2.1 hrs
Mini Fridge (120W) ~0.7 hrs
LED TV (100W) ~0.8 hrs

Planning estimates use 85% usable energy. Actual runtime varies.

Pros & Cons

  • Lithium-ion battery chemistry
  • 1 compatibility relationships mapped
  • Exact Amazon product match verified
  • Runtime changes with real device load

✓ Best For

  • Large 12V gasoline engines up to 10.0L and diesel engines up to 8.0L
  • Buyers comparing verified specifications
  • Runtime planning and backup sizing

× Not Ideal For

  • Loads above its continuous output
  • Buying without checking actual device wattage
  • Assuming every accessory is cross-compatible

Ports & Connectivity

  • Lithium-ion battery
  • 1 mapped cable / adapter requirements
NOCO Boost X GBX155 4250A Jump Starter connectivity overview

Compatibility & Expansion

↔
12V lead-acid starting batteries; up to 10.0L gasoline and 8.0L diesel enginesMapped compatibility record
→

How We Verified / Evidence Methodology

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Specifications

Manufacturer/model data

⚖
Fit & Comparison

Capacity and output

⌁
Compatibility

Mapped accessories

✓
Evidence

No guessed product images

Source verified against manufacturer documentation. Learn more about our verification process →

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FAQ

How much power does this model store?

99Wh of nominal capacity is currently recorded.

Can this run a refrigerator?

It depends on running wattage and compressor surge. Use our runtime calculator with the appliance load.

Can capacity be expanded?

Expansion and compatibility relationships are listed above where verified.

Is it safe for sensitive electronics?

Check output type, voltage requirements and device manufacturer guidance before use.

What solar panels are compatible?

Solar-input details are still being verified.

Where should I buy it?

We have an exact Amazon product match for this model.

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94Exact Amazon matches

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Detailed Review & Buying Guide

The NOCO Boost X GBX155 is a high-output 12-volt lithium jump starter rated at 4,250 peak amps. NOCO specifies it for gasoline engines up to 10.0 liters and diesel engines up to 8.0 liters. Its output range targets large pickups, SUVs, commercial vans, RVs, boats, and heavy equipment that still use a 12-volt lead-acid starting system.

Quick verdict

The GBX155 is the Boost X model for buyers who need serious engine coverage without moving to a dedicated shop cart. It combines a 99Wh lithium-ion battery, 4,250-amp peak rating, 60-watt USB-C Power Delivery, 500-lumen light, and IP65 enclosure. The tradeoff is size and weight: at 5.82 pounds, it is better suited to a truck, RV, boat, or organized recovery kit than a small glovebox.

Verified specifications

SpecificationNOCO GBX155
Peak current4,250 amps
Battery system12V lead-acid
Gas engine ratingUp to 10.0L
Diesel engine ratingUp to 8.0L
Internal energy99Wh lithium-ion
USB-C input/outputUp to 60W
USB-A outputUp to 10W
Flashlight500 lumens
Ingress protectionIP65 with ports closed
Dimensions12.03 × 6.89 × 2.72 inches
Weight5.82 pounds
Warranty1-year limited warranty

Starting large engines

The GBX155’s stated engine range covers many full-size gasoline and diesel applications. Capacity, temperature, cable contact, starter condition, and the vehicle battery’s failure mode still affect results. A jump starter cannot correct a seized engine, failed starter motor, broken cable, or internally shorted battery. Keep the unit charged and inspect it periodically rather than assuming it will remain ready after months of storage.

NOCO’s 60-second timer limits each high-output starting session and helps conserve stored energy. The manufacturer rates the unit for up to 18 jump starts per charge under favorable conditions. USB-C fast charging can fully replenish the unit in roughly 2.7 hours with an appropriate Power Delivery source, and a short five-minute charge may provide enough energy for a jump attempt when the pack is depleted.

Safety and manual override

UltraSafe 2.0 provides spark-proof connection and reverse-polarity protection in normal use. Manual override is intended for batteries below the unit’s automatic detection threshold, but it disables those standard safeguards. The user must verify positive and negative clamp placement before activating it. Never connect the booster to a 24-volt system or to a battery that is cracked, leaking, swollen, frozen, or otherwise unsafe.

Emergency lighting and device charging

The integrated 500-lumen light can illuminate a large engine compartment and includes emergency signaling modes. USB-C and USB-A outputs can charge phones and other compatible electronics. That feature is useful in outages or remote locations, but the unit’s primary job is vehicle starting. When help is far away, reserve enough energy for the engine rather than draining the pack into accessories.

What is included

Who should buy it?

Choose the GBX155 for large 12-volt vehicles within the official 10.0-liter gasoline and 8.0-liter diesel limits. Smaller vehicles can use a lighter and less expensive model. Confirm system voltage before buying, especially on commercial equipment. The exact Amazon listing tied to this page is model GBX155, ASIN B08WZFPXFM. Specifications and exact imagery were verified against NOCO’s current pages on August 28, 2026.