Boost GBX55 1750A UltraSafe Jump Starter, 12V Lithium Battery Booster

I recently purchased this refurbished NOCO Boost X GBX55 in 'mint condition.' While it arrived with only a USB-C to USB-C cable and no wall plug, I was able to scavenge a cord/power block to ensure it was fully charged. Less than 15 min later . . . my 2003 350Z had been sitting for a couple of months and the battery was completely dead, so the NOCO unit wouldn't detect the battery at first. I used the manual override feature, which got the jump going immediately. After a good drive, she is now purring and zooming—definitely awakened properly from her slumber!

This NOCO Boost X GBX55 paid for itself the first time I truly needed it. During a severe Truckee/Reno/Tahoe snowstorm in January 2026, I was stuck in a snow-packed parking lot at around -10°F with roughly 5 inches of snow on my vehicle. My Mercedes V6 SUV would not start. I connected the GBX55, and it brought the engine back to life quickly and without drama. Then I used it to help two other stranded drivers, including V6 and V8 vehicles. After jump-starting three vehicles in extreme cold, the GBX55 still showed around 30% battery remaining. That was the moment I became completely sold on it. From my own real-world use, this jump starter performed exactly the way NOCO says it should. It feels compact, powerful, and straightforward to use, with enough starting capability that I now consider it essential winter equipment. The fast USB-C charging is another major advantage. I recharge mine using a genuine Apple MacBook Pro 120W USB-C charger, and topping it back up is surprisingly quick. That is a big improvement over older jump packs that can take hours to recharge. It is also much more than a jump starter. During camping trips, I have used it to recharge my iPhone Pro Max and iPad Pro. I normally rely on my Anker SOLIX C2000 power station for serious camping power, but the NOCO is perfect when I just need a compact backup battery for phones, tablets, or other USB devices. The built-in flashlight has also been genuinely useful. I have used it both during roadside situations and around the campsite at night. Having emergency starting power, portable USB charging, and a flashlight in one compact unit makes this much more useful than something that just sits in the trunk waiting for a dead battery. One limitation worth knowing: the included positive and negative leads are fairly short. This can become a problem on newer vehicles where the positive jump terminal and recommended grounding point are far apart. On my 2024 Lexus RX 350h, I needed additional reach on the negative side to get to an appropriate grounding point. I was able to extend the connection using a jumper cable and successfully start the vehicle. What impressed me most: * Started my Mercedes V6 SUV at around -10°F * Helped start three vehicles before dropping to roughly 30% * Handled V6 and V8 vehicles without struggling * Very fast USB-C recharging * Doubles as a useful power bank for phones and tablets * Built-in flashlight is useful for emergencies and camping * Compact enough to keep permanently in the vehicle The biggest recommendation I can give is simple: don’t wait until you need one to buy one. A tow or roadside-service call during a major winter storm can easily cost hundreds of dollars, assuming someone can even reach you quickly. In my case, one snowstorm justified the cost of this jump starter. I now consider the GBX55 a must-have emergency item for every car, SUV, truck, or RV I depend on. Keep it charged, keep it in the vehicle, and hopefully you never need it—but if that day comes, you’ll be very glad it’s there.

I purchased this is Dec of 2023. Every six months or so I fully charged it. Used it twice. Now it is compltely DEAD> willl not take a charge, will not power on. I have attached a pic of a charger I use that lets me know how many watts are being drawn when plugged in. This will not light up. MEaning there is NO watts drawn. Great company. I wrote them and they replaced it even though it was out of the warranty period! Thank you Noco!!!!!!

Back Ground: I bought this yesterday because I had a car with a battery so dead, not even the warning alarms sounded when I got in. It had been dead for a couple of months. Now, I have a regular jumper which is a Li-Ion battery in a case. I had hooked it up, and let it sit for a minute. No Luck. Tried a long time charger, no luck. Damn, then I recalled my sister who lives in the next town over had a jumper she swore. I called, she came over. At first we did have to recharge her jumper, and it took all of like 5 minutes, and we go out to the car, hook it up. She looks at her watch and says Wait one minute. Then she tells me to go start the car. I am like "You're joking me?" Nope, so I got in the car, (still no sounds) put the key in, (Still no sounds) and then I turn the key. It was like that battery had never been dead. Instant on, everything as the engine rolled over and started on the first turn of the key. Now that alone is worthy of praise but then I asked her "how long do I need to keep the car running, she "I don't, I only to jump once in a while." So the Next morning I come out, and go to the car and guess what. It still started like it was never dead. Two other jumper boxes failed completely to even get the warning bells and dashboard to light up. This one, jumped the car and it runs like it near had a bad battery. Ergo, while I didn't use my box (as I didn't one) I used hers, and she has had for a couple of years and it has never failed her. Also a friend of hers, who originally owned it, gave it to her and he bought the one that can Jump Start a dead diesel engine battery. Note: There are more jumpers all over the place, even by this company, so if you have a bigger vehicle, check the numbers and get one for your car or bigger. I have seen Tow Truck Drivers carry a similar one, and it jumped a Chrysler 200 that has been dead for months due the electrical short that kept draining. Not Cheap, but also with that kind reliability, you don't have to worry about being stuck in the middle of nowwhere, and as bonus it will jump 20 cars on a single full charging itself.

The NOCO Boost X GBX55 is an outstanding portable jump starter that combines impressive power, compact size, and excellent build quality into one reliable package. It is powerful enough to start larger gasoline and diesel engines while still being small enough to store easily in a vehicle, toolbox, or emergency kit. One of the biggest strengths of the GBX55 is how fast and dependable it performs. Even on weak or nearly dead batteries, the jump starter delivers quick starts without hesitation. The UltraSafe technology adds confidence by protecting against reverse polarity, sparks, and incorrect connections, making it very user-friendly even for people who are not mechanically experienced. The USB-C charging capability is another major upgrade compared to older jump starters. It charges quickly and can also be used as a portable power bank for phones, tablets, and other electronics, which makes it even more useful during road trips or emergencies. Battery life is excellent, and the unit holds a charge well during long periods of storage. Build quality feels premium throughout. The clamps are sturdy, the housing feels rugged, and the overall design is compact without sacrificing performance. The integrated flashlight is also a helpful addition for nighttime roadside situations. Compared to traditional bulky jump packs, the NOCO Boost X GBX55 is far more convenient and modern while still delivering serious starting power. It provides peace of mind knowing a reliable backup starter is always available when needed. Overall, the NOCO Boost X GBX55 is an excellent investment for anyone wanting a dependable, portable jump starter. It is powerful, easy to use, compact, and packed with useful features, making it one of the best options available for vehicle emergency preparedness.

This is a scam. Works great for charging your car and items. But stupid design the red port got shorted with my usbc cable that I was going to use to charge my laptop. Loved this thing. But now it’s dead because the usb cable short dingy cable that I was gonna use to charge my phone, tapped the red or black port and boom short. This thing needs to have a separate button for a charge only or for USB-C only to use as charging your laptop and so the porch don’t show each other out super disappointed and the funny thing is it’s out of warranty perfect timing for something like this to happen $180 or $200 down the drain

Peace of mind having a jump box in the car.

Work good

Todo muy bien

Za pierwszym razem przyszedł nie ten produkt co zamówiłem. Po czasie dostałem odpowiedni i jest ok. Odpalałem już 6.0 v8 gdzie Alu był trup z cumminsem tez sobie dobrze radzi. Urządzenie póki co polecam

خفيفة الوزن وجميلة وعندما أستخدمها سوف أحدث هذه الصفحة مرة أخرى بمشية الله.

Robuuste en goede kwalteit startbooster. Geloof niet alle slechte verhalen over NOCO, dat zijn uitzonderingen die te veel zijn uitvergroot. NOCO is een van de meest bekende marktleiders in startboosters en maakt zeker geen rommel. Zelfs de Nederlandse ANWB pechhulp gebruikt dit merk! Ik heb met 1x opladen tot 4 keer en zonder enige problemen een 2.0 dieselmotor kunnen starten. Ook een dieselmotor met volledig lege accu kreeg ik gestart met de speciale lege accu functie. Het opladen gaat binnen 15-30 minuten als je een zwaardere USB-C lader met PD en goede USB-C laadkabel met PD gebruikt. (PD USB, oftewel USB Power Delivery (PD), is een universele snellaadstandaard voor USB-C-poorten die apparaten zoals smartphones en laptops sneller en veiliger kan opladen door de benodigde hoeveelheid stroom dynamisch aan te passen.)

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