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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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$369.95 Why this price?
Memorial Day Sale · 16% off was $439.95

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Availability: In Stock.
Fulfilled by Amazon
Arrives Tuesday, May 26
Order within 23 hours and 45 minutes
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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


Battery Cell Composition: Lithium


Voltage: 12 Volts


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


Vehicle Service Type: ATV, Motorcycle, Passenger Car, RV, Tractor, Truck, UTV, Van, Watercraft


Battery Type: Lithium


Voltage: 12 Volts


Compatible with Vehicle Type: ATV, Motorcycle, Passenger Car, RV, Tractor, Truck, UTV, Van, Watercraft


Battery Capacity: 6750 Milliamp Hours


Amperage: 4250 Amps


Peak Output Current: 4250 Amps


Automotive Fit Type: Universal Fit


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


Item Weight: 7.01 Pounds


Specification Met: energy


Brand Name: NOCO


Manufacturer Part Number: GBX155


Manufacturer: NOCO


UPC: 046221200096


Global Trade Identification Number: 96


Model Number: GBX155


Item Type Name: Jump Starter


Unit Count: 1.0 Count


Included Components: 1-Year Warranty, 12V USB-C Fast Charger, GBX155 UltraSafe Portable Lithium Car Battery Booster Jump Starter Pack, Heavy-Duty Jumper Cable Clamps, Microfiber Storage Bag, Power Bank with 60W USB-C Power Delivery, USB-C Charging Cable


Manufacturer Warranty Description: 1 Year Limited


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, May 26

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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Top Amazon Reviews

    • It just works! Don't buy an El Cheapo "Gibberish Brand", buy this one! You WILL NOT be disappointed!
So, you're looking at this because you have a 1-ton truck? Dual batteries? And I'm guessing in the cold your engine simply just doesn't want to start, right? Or perhaps you've got a vehicle that loses battery charge after a couple days of being unused? Or perhaps you have a habit of accidentally leaving the dome light on all night? Or perhaps your battery just isn't up to snuff anymore and you just want to make sure it starts, regardless? And now you're looking at that price of $370 (at the time of this review) and thinking to yourself "There's got to be a cheaper one that will get the job done, right?" Short answer? Possibly. Shorter answer? DON'T! <] TLDR [> It absolutely works. It delivers the power it advertises. It's worth the money. If you want a boost pack that just works and you can afford it? Then just buy this one! You will NOT be disappointed! DO NOT buy the cheaper "Gibberish Brand" packs. If you do, you WILL be disappointed and they WILL leave you stranded. Yep. it really is that simple! My ONLY regret in buying this jump pack is that I didn't buy it sooner! I just couldn't justify the price tag... If I had known just how good it is, I'd have made room in the budget for it a lot sooner than I did! <] /TLDR [> I have a 1998 GMC K3500 with a dual battery setup. I do NOT have a block heater (yet). At zero degrees (F), it turns over but REFUSES to catch. After turning the engine over for roughly 10 seconds on a fresh full charge, it just quits. No go juice! And if you've done like I have by adding a manual override for your glow plugs because you upgraded them and know they can handle the extended burn time? It's still not enough. The batteries are just too small to be viable in the winter on the Canadian border where I am. [ Edit 3/19/26: I forgot to mention in this that I also upgraded my starter to a planetary gear high torque high speed starter, and it STILL doesn't like to catch in colder temps! ] Now that you have the backstory, I too was put off by the price. I watched a LOT of videos comparing various jump packs and every single one of them rated THIS pack, the NOCO Boost X GBX155 as the highest in every single list. I really had a tough time shelling out the cash for this, but now that I have it? I'll NEVER give it up! This thing is super easy to use. Charge it up when you get it. Believe it or not, for as heavy and bulky as this jump pack is, it charges FAST. From depleted to full charge in under 3 hours! That's AMAZING! If you have a dual battery diesel truck like me? You're going to be absolutely ASTONISHED at just how much power this thing packs. Its punch is nothing short of INCREDIBLE! When you hook it up to your battery, make sure you connect it to the battery that has the positive lead straight to the starter. While it'll work, connecting it to the accessory battery WILL cause a loss of power to the starter simply because of the cable run length from the accessory battery over to the primary start battery and then to the starter. Really, the only thing I can say I'm not too fond of is where they put the button to turn on the flashlight function. That darned thing is RIGHT where I grab it to pick it up and every time I pick it up I inadvertently press the flashlight button and let me tell you, it's pretty darned bright! This thing will also let you override the error condition on a FULLY depleted battery to allow you to jump the vehicle regardless of your battery voltage. Another really nice feature is the fact that it also has two USB-A ports to charge another device with, like your phone. The USB-C charging port can also be used to charge another USB-C device, too! The charging port goes two ways! The real reason you're looking at this specific jump pack though, is to find out if it lives up to its promises. I can tell you that yes, it absolutely does! Keep this in your vehicle and you'll end up being a hero to someone if they need a jump, too. No more need to carry long, heavy jumper cables if you've got this thing! You can rest easy if you have this jump pack. If you get into a spot of trouble because you left your headlights or marker lights or dome light on and ran your battery down while you were at the theater watching a movie or something? This will absolutely get you out of a jam. My truck is nearly 30 years old. I upgraded the starter to a planetary reduction gear starter. In the summer months, the dual batteries spin the engine decently with the specific starter I upgraded to. However, this jump pack? At ZERO degrees Fahrenheit, this jump pack cranks the engine over even faster than the dual batteries in the truck do! Because of where I am and my current vehicle situation, I'm having to jump the truck virtually every time I want to go somewhere. The truck's batteries just aren't enough and there's really no easy way to install bigger, more capable batteries under the hood. But, with this jump pack? I don't have to worry about whether the truck will start or not. It's virtually guaranteed it will. Without this jump pack, I'd be stuck most of the time in winter! You could call it peace of mind and you'd be accurate! If you're on the fence between this and a cheap one that's half the price or even a quarter of the price? Do yourself a favor! Forget the cheap ones, they don't stand a chance against this one. If you've got a family and you NEED your vehicle to just WORK regardless of having left that dome light on all night? You won't be disappointed if you have the NOCO Boost X GBX155. It's worth every penny! ... show more
Reviewed in the United States on January 1, 2026 by Frozen Acorns
    • One Booster Everything Boosted
Review Image by JonJebus
Review Image by JonJebus
Review Image by JonJebus
Review Image by JonJebus
Review Image by JonJebus
I’ve had this battery booster for over a year now. Gotta say, I had no idea how helpful these things are. I went with the 4250A as I have a big ol’ diesel truck, but it works on all my toys. I’ve used it on my Jeep, the diesel truck of course, my zero turn mower, and my dirt bikes. It’s never let me down as of yet. I find it takes about 3 or 4 hours to fully charge if you’re using a high quality USB-C cable, and I can get 7-10 jumps from it until needing to charge again. Though, the amount of usages is gonna depend on what you’re jumping. Meaning, the diesel truck takes way more power to start than the Jeep. In conclusion, I think this should be in everyone’s tool kit. I highly recommend 🤘 ... show more
Reviewed in the United States on April 5, 2026 by JonJebus
    • Excellent Customer service - Stands Behind their Fabulous producst!
Purchased January 30, 2025. UPDATE April 18, 20206 Changed back to five stars. NOCO support is amazing!!! In spite of the "out of warranty", they had me ship the old one in. They sent me a a New GBX155! I have three of these Jump Starters - one for my car and two of the GBX155s for my two diesel trucks. The are older trucks and sometimes I leave something on inside. They are much safer than jump cables - you never know when someone else makes a mistake. Until the one I describe below, None of my NOCO products have ever had a problem. I have been buying their chargers (NOCO Genius G3500, and larger) and have had them for years. Quality is superb! Now I can say, so is customer service. ********* Original: On March 16, 2026, I discovered it dead. No lights, no nothing. Will not take a charge. I expected a lot more from this. ... show more
Reviewed in the United States on March 30, 2026 by J. Treg
    • Don’t Recommend
Review Image by Chad Goff
Review Image by Chad Goff
Bought this back in October 2025 just to keep in my truck for emergencies. Used it only twice now. Once being the other day to start a Honda pilot. Another time used for a Ford F250. Was fully charged when I stored in truck. Noticed it was down a bar without using on anything. Started car fine but put it down to 1 bar. Didn’t think anything of it other than it needed to be charged. Plugged in over night using supplied charger. The next morning checked and it didnt charge at all. First thought maybe a faulty charger. So used another noco brand charger that a friend lent me. Once again left on charger over night. This morning checked and still will not charge over 1 bar. Hardly even lasted me 4 months. Only used twice now. Those were 2 expensive jumps. Pictures shows using the correct charger. And second picture shows it is just flashing on the seconds bar. Even after being plugged in for over 24hrs now. Wouldn’t recommend, or buy again after the cost of product only getting me 2 uses in 4 months. I have used the noco chargers for couple years now on my motors cycles over winter and haven’t had any issues. Was hoping the boost would be same quality but unfortunately is not. ... show more
Reviewed in the United States on March 8, 2026 by Chad Goff
    • Easy to Use, Saves Excess Hassle
Works great! I have a smaller one made by GooLoo that works decent but no longer works as good as it used to, and any time it's below 50% battery it constantly turns itself back off, so I started looking for a new jump starter. Opted for this one and I've had zero issues since switching from GooLoo to this one. Overall it isn't "too smart" to the point it becomes annoying or useless, and when fully charged has even managed to help start my 5.9L Cummins diesel pusher class A RV. Super easy to use and has basic safety features built in. I love its overall size and portability. If you do not have a 60 watt power supply with a matching cable, it will take a little while to charge, however. Though as long as I remember to plug it in overnight after using it I've had no issues with it usually being fully recharged by the following morning. I've had Snap-On jump boxes that didn't last more than two years before no longer working. So far about 6 months in and this one is still working great! ... show more
Reviewed in the United States on March 4, 2026 by Adam

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