NOCO Boost X GBX155 4250A 12V Lithium Jump Starter Review (2026)

Built for big engines and group trips

The GBX155 is rated to jump gas engines up to 10.0 liters and diesel engines up to 8.0 liters, well beyond what a typical sedan or small SUV needs, which puts it firmly in the category built for full-size trucks, tow vehicles and RVs. On a group car camping trip where several vehicles are parked together, that extra capacity means it can realistically jump more than one dead battery in a day without needing to fully recharge in between. Anyone driving a large diesel truck to tow a trailer or camper, or organizing trips where multiple vehicles could stall out, is the target buyer here rather than someone with a single compact car in the driveway.

4250A peak, 99Wh battery, fast USB-C charging

Inside is a 99 watt-hour lithium-ion battery, among the larger capacities NOCO offers in a jump starter, paired with a peak output of 4250A for starting larger, harder-to-crank engines. It recharges through USB-C at up to 60W, reaching a full charge in about 2.7 hours from empty, and NOCO states it can go from a dead battery to ready-to-jump in as little as 5 minutes of charging in a pinch. Beyond jump starting, the same USB-C port can deliver up to 60W to charge a laptop, phone or other device, and it includes a 500-lumen flashlight with multiple modes for use around camp at night.

Safety features and everyday handling

The clamps use NOCO's UltraSafe 2.0 technology, which includes spark-proof design and reverse polarity protection, reducing the risk of a dangerous connection mistake in low light or cold hands. It carries an IP65 rating with the ports closed, meaning it can handle rain and dust exposure at a campsite better than an unsealed unit. Always follow NOCO's included instructions for clamp order and polarity when jump starting, since improper connection on any jump starter, regardless of brand, carries real electrical risk. The unit also includes an automatic power-conservation shutoff after a period of inactivity to protect its own charge level between uses.

More jump starter than most cars need

Compared with NOCO's own smaller Boost Plus GB40, rated at 1000A for engines up to 6.0 liters, the GBX155 is a noticeably bigger, heavier and pricier unit built for a different scale of vehicle. If your camping fleet is small cars and crossovers, a mid-range NOCO model like the Boost HD GB70 covers most needs without the added bulk and cost of the GBX155's extra amperage. The tradeoff for that extra capacity is a larger, heavier pack that takes up more glovebox or trunk space, worth it only if you are regularly dealing with larger engines or the possibility of jumping more than one vehicle per trip.

Verdict and who should size down

This is the right jump starter for truck owners, tow-rig drivers, and group trip organizers who want a wide safety margin and the ability to help out more than one stalled vehicle over a weekend. For most car campers driving a single sedan, hatchback or small SUV, a smaller and less expensive NOCO model will jump start just as reliably with less bulk to carry around, making the GBX155 more capability than most single-vehicle trips actually require. If you are unsure which size fits your vehicle, checking the engine displacement against NOCO's rated range for each model is the simplest way to decide before spending extra on capacity you may never use.

Frequently asked questions