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

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. 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!

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!

It's a beast 💪, this thing will start my diesel dually with no batteries in it. It was resold because it was returned, but I couldn't tell if the box was even opened. 265 bucks. I couldn't pass that up. I bought a 120 volt 65 watt charger that worked great and charges in 45 minutes. If your on the fence? Just grab it. You'll be happy.

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.

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.

Calidad, precio bien.... ahora veremos cuanto tiempo dura.

Ce n'est pas mon premier Booster NOCO. J'aime la puissance sans limite... Mais avouons que celà devient un peu encombrant. Belle qualité de fabrication. Mais NOCCO ne protège pas sufisement ses boutons. Donc dans un petit sac fournis, il est probable qu'il s'allume tout seul et finisse par vider ses batteries. Un petit morceau de carton suffit a se protéger du problème.

I bought two of these as I am a owner of a large number of classic cars as well as some lager vehicles like trucks and tractors. I was going to go down the professional gear mechanics use but $4500 a units, and they are huge, was too much so I decided to take a punt on these. As mentioned previous they are great, have started all sorts of equipment from cars to tractors to 13T trucks. I am just about to purchase some more around the 3000A mark and keep the big GBX155 in my workshops.

GOODNESS ME, this thing packs a huge punch. Started my 4x4 that had a completely kaput battery in a matter of 2 seconds. Not cheap but its an awesome bit of kit

Ho acquistato il NOCO Boost X GBX155 per avere un avviatore di emergenza affidabile sia per auto che per furgoni diesel. L’ho testato su una batteria completamente scarica di un 3.0 turbodiesel: in pochi secondi ha avviato il motore senza alcuno sforzo. La potenza da 4250A è reale, e si percepisce dalla velocità con cui eroga corrente. Oltre alla funzione di avviamento, può essere usato anche come power bank per ricaricare smartphone, tablet o altri dispositivi grazie all’uscita USB-C PD. L’interfaccia è semplice e intuitiva, con led ben visibili anche in pieno sole. Punti di forza: • Potenza elevatissima, adatta anche a motori diesel di grossa cilindrata • Avviamento rapido anche con batteria completamente morta • Funzione torcia e power bank USB-C molto utili • Cavi robusti e morsetti di qualità, con protezione intelligente contro inversione di polarità Unico difetto: Non è economico, ma per chi cerca un prodotto professionale e vuole stare tranquillo in ogni situazione, è un acquisto che si ripaga da solo al primo uso. Conclusione: Uno strumento indispensabile per chi lavora con veicoli o semplicemente vuole sicurezza in auto. Qualità costruttiva eccellente, potenza reale e facilità d’uso. Lo consiglio senza riserve e lo ricomprerei subito.