Boost X GBX45: 1250A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 6.5L Gas and 4.0L Diesel Engines

Purchased this as we have many things that may require a jump start. It charges quickly and is very easy to hook up and jump start anything we need it for. It is a nice, compact size and comes with a carrying case. It works great and we would highly recommend it.

The 1250A UltraSafe Jump Starter is a compact and reliable lifesaver for every driver. With 1250 amps of starting power, it easily jumps most cars, trucks, SUVs, and even some boats without needing another vehicle. Its portable size makes it easy to store in the glove box or trunk, and built‑in safety features give peace of mind — no sparks, reverse polarity protection, and overload protection make it user‑friendly even for first‑time users. The included USB ports and LED flashlight are great extras when you’re on the road, and the battery holds a charge well over time. Setup is simple — just connect the clamps, and you’re ready to go. Pros: Compact, powerful jump starting, safety‑focused, USB charging & flashlight Cons: Best suited for occasional use vs. heavy frequent use Bottom Line: A reliable, easy‑to‑use jump starter that gives confidence on the road — perfect for emergencies and everyday preparedness.

I bought the GBX45 for my Harley Iron 883 and it works like a charm. It got my bike started in no time. The best part is how fast the unit itself recharges: it took exactly 1 hour to go from empty to 100%. Highly recommended for any rider!

Just go ahead and buy it, it’ll save you one day trust me. Let me tell a little true story basically I’m a bass head and I wanted a sub in my jeep so I took the kicker sub and amp I had in my truck and put it in my Cherokee unfortunately we did not reconnect the cable that travels from the alternator to the battery bus bar however the cable was on the post, the first sign of the problem occurred when the stop/start system was disabled shortly after driving away. I thought this was because the car detected the subwoofer was now drawing power so it disables the system so I ignored it. We did all this on Saturday evening and everything was going smooth, Until “Wednesday” came around. So I’m driving to work on the interstate in the first three warnings that came appeared were ABS, Stability Control, and my parking brake were all disabled. Forgot to mention my card did start mentioning something about a low power state but I didn’t know what that was about but now I know; Anyways I stop at a red light, and things start to get real problematic first my AC starts turning on and off and then my head unit blacked out. I put the card in park because I didn’t know what was going on. I opened the back of my jeep manually as the Rear powered door is also disabled. I glance over at my Subwoofer Amp (Kicker 800.1) and I see two lights on at the same time power and protect meaning the voltage in my car battery was below 10 1/2 V and I verified that with my multimeter as I work with AC units so I jumped my car battery off with a little bit of voltage from the pack and I was able to quickly get to work in the afternoon. It turns out I did not reattach the nut nuts for the battery lead meaning the car battery was never truly charging. If you’re thinking about buying a cheaper, one of these, you might want to stick with this brand as they are very reputable charge very quickly through USB-C power delivery, which is very handy. It is in my opinion the safest jump pack as you cannot short the output unless you override the pack, which I have done before sorry about that Noco, but I had to experiment. Sheep was work, but they’re usually made with cheaper batteries so they don’t hold a charge very well and they die pretty quickly so it might be only good for six or seven cranks. This jump pack also has many safety features and temperature protection. And it has a flashlight. I don’t know what else to say but I strongly recommend buying this jump pack. It’ll save you when you’re in a jam and it saved me from being stuck at a green light.

This product worked great. I live in the northeast and have an old car that has been sitting for about 6 months. The last month was under a mountain of snow. My Noco arrived today charged it up for about a hour. Put it on the battery and the car started on the first try. The battery was completely dead. I even tried it on a trickle charger a few months ago and it faulted saying the battery wasnt holding a charge. The only downside I saw was a lack of instructions. I had to google around to find how to use it. The charging lights werent that intuitive. There is an override button that you have to press if the battery you are jumping is below 3 volts or so which mine was as it was completely dead. That kept me from giving it 5 stars. Otherwise, it worked great.

Bought approximately 4 years ago and always worked when I needed it to. Reason I'm writing this now is to tell about the heartiness of the this thing. I charged it fully to take with me for an ATV trip Sept./Oct. 2025. No issues on the trip. Got back and accidentally forgot about it in the box on my machine until today. Got a call from my mom saying her vehicle wouldn't start after being outside in below 0 weather for close to a week. So I dug out the NoCo and brought it in the house for about an hour or so to warm up. Checked the battery level and had 3 of 4 bars. Good enough to attempt to jump start her V6 Jeep. Got to her place and hooked it up and no go. So I did the override delivering full amps and it started right up! I was shocked considering it has been almost 4 months of being outside but protected from the weather except temperature. I would definitely buy this 1 again!

This is a really great product. It replaces my ungainly set of jumper cables and fits in the glovebox. It is easy to use, convenient to charge, and ready in an emergency. Since it is battery powered, I take it out once in a while to make sure it is fully charged. It can even be charged using the vehicles charging ports. I recommend this product.

Really impressed with this jumpstarter. I have owned this for a few years and have used it on various vehicles, it always works effortlessly. However a few weeks ago I had to put it to the real test. Our fire engine at my job had not been plugged in the night before and was reading around 7.5 volts on my meter, it wouldnt even turn over. It was a Sunday so no one was avaliable to come out and work on it. I figured I would give my noco a try. Our fire engine has an L9 Cummins with 4 giant batteries. I hooked it up and hit the boost button, waited a few seconds and started the truck. It fired right up! The noco had used about half of its battery and had the temperature light flashing for a while but it was able to do it. Once it cooled down it charged right back up. I wouldnt recommend doing this everyday with this sized battery, but it definitely has the beans to do it.