NOCO Boost X GBX45 jump starter review

Overview

The NOCO Boost X GBX45 is a premium portable jump starter designed for drivers who want more engine support than a compact car-focused booster, plus fast USB-C charging. It ranks #4 in our list of the top 10 best-selling portable jump starters on Amazon UK, with an 8.8/10 score and our Best for fast USB-C charging award. The GB70 sits higher at #1 as our best overall pick, while the smaller GB40 is #3; the GBX45’s distinction is its 60W USB-C Power Delivery and claimed faster recharge. Owners report that it starts cars and vans reliably, but its premium positioning and the extra charger requirement matter if you mainly need occasional backup for a small petrol car.

Features and specification

NOCO rates the GBX45 at 1,250A peak current and lists support for petrol engines up to 6.5 litres and diesel engines up to 4.0 litres. Those are manufacturer limits, not a guarantee for every vehicle: battery condition, temperature and correct connection can affect starting. UltraSafe 2.0 includes spark-proof and reverse-polarity protection, though it is still important to follow the instructions and connect the clamps correctly.

The 60W USB-C Power Delivery port works as both an input and output, so the unit can charge devices such as phones, tablets and compatible laptops. The listing claims a full recharge in as little as 48 minutes using a 60W charger, or enough charge for a jump start after five minutes; the suitable wall charger is not included. It also claims up to eight starts per charge, subject to conditions. In the box are jump leads, a USB-C cable and a storage bag. The 1.2kg unit has a 100-lumen torch with seven modes, including SOS and strobe, and comes with a one-year warranty.

What owners say

Owner reports commonly praise quick, straightforward starts on cars and vans, including diesel vehicles. Several describe the booster as useful to keep in the boot for unexpected battery problems, and appreciate that it can also charge personal devices. Its compact size, solid-feeling clamps and built-in light are recurring positives. Some owners also report that it has held its charge well while stored, although that should not replace periodic checks and recharging according to the instructions.

There are caveats in the feedback. One owner says it did not help with a fully dead battery, while another reports a unit that stopped working after a year; these are individual complaints, but worth noting alongside the one-year warranty. Some mention that the leads are short, so positioning the booster close to the battery may be necessary.

Who should buy it

Consider the GBX45 if you want a portable booster for a mid-sized diesel or larger petrol car, value its dual-purpose USB-C output, and are willing to buy a compatible 60W charger separately to access the fastest recharge. It also makes sense for drivers who want a compact emergency kit for a van or regular trips away. If your needs are limited to a small petrol car, or you want a lower-cost option with no need for fast USB-C charging, compare the GB40 or a budget pick instead. Whichever booster you choose, keep it charged and use it in line with the vehicle and product instructions.