NOCO

NOCO Boost X GBX155 UltraSafe Jump Starter

Name: NOCO Boost X GBX155 UltraSafe Jump Starter
Brand: NOCO

UPGRADE

Raw cranking authority defines this costly, heavy upgrade: independent testing recorded 879A at 8V, and the 99Wh pack retained enough charge for reliable cold starts.

$370 typical

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EDITION 01RESEARCHED 2026-10-093 SOURCESREFRESH DUE 2027-04

SUBSTANCE SCORES

substance8.2/ 10

design6.5/ 10

value7.6/ 10

WHY THE PRICE IS JUSTIFIED

The price is supported by independently measured high electrical output, strong cold-weather performance, a 99 Wh-class lithium-ion pack, USB-C Power Delivery up to 60W, IP65 protection, and safety circuitry. The premium is not justified by the 4250A label alone: independent testing measured about 7,000W under load rather than the claimed peak-current figure.

CRITERIA

10/10

Real Cranking Output

Independent bench test measured 879A at 8V, or just over 7,000W, the strongest result in that test.

10/10

Cold Dead-Battery

Independent testing after 15 hours near 4°F found it made very easy work of starting the diesel and performed best.

8/10

Usable Battery Energy

Independent discharge testing reported over 70% of advertised capacity, placing NOCO among the better-performing units.

5/10

Leads And Clamps

No provided source documents lead or clamp construction or independently tests their performance.

8/10

Fault Protection

NOCO claims UltraSafe 2.0 spark-proof and reverse-polarity protection; manual-boost behavior is not documented in the provided sources.

5/10

Storage Durability

NOCO claims enhanced thermal efficiency and longer battery life, but no long-term storage or durability test is provided.

9/10

Emergency Usability

Includes a 500-lumen flashlight, SOS and strobe modes, USB-C charging, auto power conservation, and a carrying case.

IDEAL FOR

·Drivers who want maximum independently tested jump-start performance
·Large gasoline or diesel vehicles
·Cold-weather roadside emergencies
·Users needing a high-capacity USB-C power bank and flashlight

NOT FOR

·Budget buyers
·Users prioritizing the smallest or lightest jump starter
·Buyers seeking independently documented clamp, repairability, or long-term storage details

DESIGN & ERGONOMICS

Large, heavy portable unit with integrated flashlight, status LEDs, USB ports, carrying case, and straightforward controls. Its 2.64 kg weight improves portability less than smaller jump starters but supports a substantial battery pack.

LONGEVITY

The manufacturer states that UltraSafe 2.0 improves thermal efficiency, power management, and battery life. The retailer lists a lithium-ion battery and 99 Wh capacity. Repairability and spare-parts availability are not documented in the provided sources.