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NOCO

NOCO Boost X GBX155: 4250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 10.0L Gas and 8.0L Diesel Engines

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Availability: In Stock.
Fulfilled by Amazon
Arrives Sunday, Sep 21
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Features

  • X FOR EXTREME A new class of lithium jump starters. Rated at 4,250 amps for powerful starts on gas engines up to 10.0L and diesel engines up to 8.0L - built for extreme performance.
  • ULTRASAFE 2.0 Upgraded spark-proof and reverse polarity protection with enhanced thermal efficiency and power management for even safer operation and extended battery life.
  • TURBO CHARGEABLE Recharges in just 2.7 hours via USB-C Power Delivery, or gain enough power for a jump start in just 5 minutes - even from a completely depleted battery.
  • 60-SECOND TIMER Integrated 60-second timer conserves power from its high-voltage design - delivering up to 18 jump starts per charge with extreme energy at every start.
  • CHARGE EVERYTHING 60-watt USB-C Power Delivery lets you charge phones, tablets, laptops, and more. Dual-direction charging turns Boost X into a high-output portable power bank.
  • INTEGRATED LED FLASHLIGHT Precision-engineered 500-lumen LED with 7 light modes, including SOS and strobe. Illuminate repairs, emergencies, or low-light environments.
  • WHATS IN THE BOX GBX155 jump starter, heavy-duty clamps, USB-C charging cable, and microfiber storage bag. Backed by a 1-year warranty and engineered in the USA.

Description

The GBX155 Boost X is a new class of portable lithium jump starters—engineered for extreme performance and rated at 4,250 amps to start gas engines up to 10.0 liters and diesel engines up to 8.0 liters. Featuring our upgraded UltraSafe 2.0 technology, it offers spark-proof connections and reverse polarity protection, now with enhanced thermal efficiency and power management for even greater safety and battery life. Designed with a high-voltage output system, the GBX155 includes an integrated 60-second timer to conserve energy—delivering up to 18 jump starts per charge with maximum power on every start. Even if completely depleted, it can gain enough power for a jump start in just 5 minutes or fully recharge in only 2.7 hours via USB-C Power Delivery. A 60-watt USB-C port provides both input and output, turning Boost X into a high-performance power bank for fast charging phones, tablets, laptops, and other USB-C devices. A precision-engineered 500-lumen LED flashlight features seven modes, including SOS and strobe, to light up dark workspaces or help in roadside emergencies. The GBX155 jump starter comes complete with heavy-duty jumper clamps, a USB-C charging cable, and a microfiber storage bag, all backed by a 1-year limited warranty and proudly engineered in the USA. Whether you’re looking for a car jump starter, battery jump box, jumper pack, power pack jump starter, or a reliable jump starter battery pack to keep in your glovebox, the GBX155 delivers unmatched performance, trusted durability, and peace of mind—on the road, off the grid, or wherever your next adventure takes you.

Brand: NOCO


Product Dimensions: 8.18"D x 4.84"W x 13.51"H


Item Weight: 7 Pounds


Amperage: 4250 Amps


Peak Output Current: 4250 Amps


Brand: ‎NOCO


Product Dimensions: ‎8.18"D x 4.84"W x 13.51"H


Item Weight: ‎7 Pounds


Amperage: ‎4250 Amps


Peak Output Current: ‎4250 Amps


Specification Met: ‎energy


Manufacturer: ‎NOCO


UPC: ‎046221200096


Global Trade Identification Number: ‎96


Automotive Fit Type: ‎Universal Fit


Model: ‎GBX155


Item Weight: ‎7.01 pounds


Item model number: ‎GBX155


Batteries: ‎1 Lithium Ion batteries required.


Exterior: ‎Machined


Manufacturer Part Number: ‎GBX155


OEM Part Number: ‎GBX155


Position: ‎Unknown


Bulb Type: ‎LED


Special Features: ‎4250A 12V Portable Lithium Car Battery Jump Starter Power Pack, 500 Lumen LED Flashlight with Multiple Modes, including SOS., 60-Watt USB-C Power Delivery Technology, Portable Power Bank for USB Devices, Reverse Polarity and Spark-Proof Protection


Date First Available: February 19, 2021


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Sep 21

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Great Power in a Compact Package
I’ve used the NOCO Boost X GBX155 a few times now, and it works exactly as advertised. It started my diesel truck with no problem. Super easy to use, charges fast, and I love that it also works as a power bank. The build quality feels solid, and it's small enough to keep in the truck without taking up space. If you need serious jump-start power, this one is worth it. ... show more
Reviewed in the United States on July 31, 2025 by ssisnowpower
    • Diesel monster
Ram 2500 6.7 L Cummins diesel (two batteries). GBX155 works great to start. Got back from vacation and truck wouldn’t start. Started right up with the NOCO but then truck wouldn't hold a charge. AAA guy shows up to house to replace batteries, can’t get truck to start. Has his charger AND his jumper cables hooked up to the Ram and could not get it to turn over. I got out the NOCO and it started right up. It started my truck at least 5 times. Didn’t want to test the limit and end up stranded in some parking lot. So not sure what the max number of charges. ... show more
Reviewed in the United States on July 2, 2025 by Jaclyn Maurer Abbot
    • Best jumper I've ever had. Worth every penny
What's needed to jump start all these new cars. If you have a newer car that 5 years are newer with the battery under the seat are in the trunk area. You need this one to jump start your car. I work as a tech and work for a luxury brand that's a pain in the ass to jump start do to battery location. Also these newer EV cars that have the 12v battery go dead. You really need a lot of power to get them enough 12v power to place them on the charger to charge the HV battery. Without a good 12v battery the HV battery can not be charged. So you get a car with a dead 12v battery and need to change the HV battery because it's low, you're in trouble. On other cars with the jump points so far from the battery and the battery buried, you need this much power. Love the size and weight compared to older jumpers I've had. So easy to carry to the car. Has held up fantastic with its constant use. Charges up quickly with the higher rate charging plug. You do need to get this unless you want very slow charging with your normal phone charger. ... show more
Reviewed in the United States on July 26, 2025 by Paul
    • Batteries Fail Prematurely
Update November 2, 2024 I purchased a second GBX155, thinking the first time was a fluke… It also failed in less than 13 months, just simply stops turning on… their warranty and repair is totally worthless…I copied it below in the review, costs more than buying a new unit in most cases. Save yourself some hassle and purchase another brand. I have the GBX 155 and it’s smaller brother, I bought them both at the same time in November 2021. They worked great for jumping, but they both died within a few weeks of each-other in September 2023. My old lead acid jumper is has been in service for around 5 years, and still works great. They should last longer than 22 months. Especially with light, occasional uses! Other than dying prematurely, they are nice jump packs. Here’s their awful warranty policies from their website as of 11/2/24. The cost to repair is more than the cost to purchase. In-Warranty: Months 0-12 Within the warranty period, any defective item will be replaced free of charge. Advanced replacement for In-Warranty claims is available with a credit card payment for the full retail amount. The full payment amount will be refunded within 10 business days after return is received. The defective unit must be returned to NOCO within 30 days for a credit to be issued. For claims outside of the scope of the warranty, including accidental damage or abuse, the replacement cost is $499.95. Out-Of-Warranty: Months 13-48 Months 13-24: Any defect is a flat $399.95 Repair Fee per occurrence. Months 25-36: Any defect is a flat $499.95 Repair Fee per occurrence. Months 37-48: Any defect is a flat $599.95 Repair Fee per occurrence. Out-Of-Warranty repairs exclude any claims outside of the scope of the warranty, including accidental damage or abuse. If a unit has damage deemed outside of the scope of warranty by NOCO, the customer is responsible for all shipping costs to have the unit returned. It is the sole discretion of NOCO to determine if damage is outside of the scope of the warranty. Advanced replacement options for Out-Of-Warranty depends on product availability and requires a credit card payment for the full retail amount that is currently listed on our website. The full payment amount, minus repair fee indicated above, will be refunded within 10 business days after return is received. The defective unit must be returned to NOCO within 30 days for a credit to be issued. If the defective unit is damaged or deemed outside of the scope of the warranty by NOCO, the customer must return the replacement unit within 15 business days or forfeit the full payment for the unit. To begin the warranty process, please contact [email protected]. To expedite the process, please send a digital copy of your proof of purchase, the units serial number, and detailed description of the problem. ... show more
Reviewed in the United States on October 5, 2023 by George
    • Great backup power station
This is a nicely made unit. It came recommended by my son who has the smaller unit. The USB ports are handy when the power is out to charge phones etc. well made. Get the case recommended- it fits perfectly and is very good quality. I put this in my rv van in case of a dead battery or if I need to charge phones, fans, laptops. Worth the money. ... show more
Reviewed in the United States on August 11, 2025 by Michele
    • This is the ONE! Don't hesitate.
This is the one! If you are thinking about getting one or thinking about the TikTok shop one, think again. This is it. It'll start whatever you've got. Again and again. I've pulled up on people charging with cables, boxes, what have you and every one has been left in the dust. They'll say "i already tried with mine and it's dead dead." It'll start. Within 15-30 seconds. Most often times , instantly. I've started big diesel boats, trucks, cars. I even ran my mini excavator on it for a half hour in the pass through mode with it. During hurricanes it charges all my devices. I'd buy one for each of my family members if I had the money. You will not be disappointed! If you can, get the lil case too. It's going on three years now with mine and I'd never use anything else again. Use: Charges everything Battery life: almost three years and i charge it occasionally. I've jumped more vehicles than I've charged it. Portable: With the case it just sits neatly in my truck at ALL times. Charging speed: that CAN take a while depending on what you use to charge it. I just leave it overnight Build quality: i destroy stuff and this looks almost like the day i got it. Why did you pick this product vs others?: It looked great and i liked it. ... show more
Reviewed in the United States on July 2, 2025 by Nickolas Wilkerson

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