NOCO Boost GB40: 1000A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables – for 6.0L Gas and 3.0L Diesel Engines

Good quality and worked fast
OK, I bought this in July 2024. It’s March 2026 and I used it for the first time. There was at least a six month period where I did not charge it and I was a little concerned whether it was going to hold the charge. I charged it two months ago, it still has full charge, it was super simple to use and quick to jump a vehicle with a dead battery. The only thing is the instruction booklet has tiny writing so read it ahead of time and maybe write yourself down some instructions and laminate them so the paper lasts in the car :-)Two people in the parking lot took pictures of this so they could get it for their cars. Highly recommended.

-15 degrees Fahrenheit an jumped 3 cars in a row during blizzard of 2026!!!
The power this little unit packs is quite impressive. It holds its charge and the coldest of weather, and has the power to jump a completely dead battery ( I even tried it with out a battery at all a still worked!)its highly durable it rolls around in the trunk of my car and hasn’t gave me an issue ( I also got the case for it)But they should have a separate button for the max power option if you have a stone cold dead battery you have to press an hold a certain button for it to jump a completely failed a dead battery. It’s has a lot of great options for charging ports for phones & tablets, bright flashlights, and the amount of storage capacity is amazing for such a small package that can jump BIG V8’s… and this past blizzard of 2026 on the east coast I had to jump 3 cars back to back an it did it with no fuss or killing the battery ( full charged it took one bar of power out of it) I’ve owned it for almost a year and have yet to charge it again except when I first got it I have it a full charge and almost a year later it still has the same charge AMAZING!!!

Needed to use override feature
Like others have said, the lack of any instructions and the lack of a wall charger makes it less than a 5 star product. I was getting ready to give it a 1 star review because it stopped working. I was having battery trouble with my wife’s car and used it twice to start her car. It worked wonderfully and was much easier than using cables and my car. On a third time of using it I couldn’t get the “ready” light to stay on and it didn’t charge at all. The unit was fully charged, it just didn’t work! Cables to the rescue! Again, needed to use it and couldn’t get the “ready” light to stay on. THEN… I watched the video on doing a safety override, needed when the dead battery is completely dead. I used this feature and it worked perfectly to start the car. Well done me for checking everything available before sending it back! 🙂 Although having that in a manual would have been nice.

Works great! Got my old car running in 30 seconds!
Works great so far! Easy to charge, easy to use, started my old car right up even though the battery was 100% dead and it hadn’t been run all winter! I’ve been charging cell phone on it too, to keep it cycling. Great buy!

Ottimo avviatore! Il NOCO GB40 è compatto ma tira fuori una potenza incredibile: avvia l’auto in pochi secondi. Sicurezza al top, non fa scintille e si collega senza paura. La batteria dura tantissimo e si ricarica via USB. Perfetto da tenere sempre in macchina!

I’ve had this for a couple of years now so have had chance to use it now and again.It started my wife’s (1.4L petrol) engine immediately when the car battery went flat, and again the next day, without a recharge in between. I had less luck trying to start the 2L petrol on a Mazda I had SORNed for two years during the pandemic – but it turned out the battery on that was completely gone (along with the bodywork of the car, sadly). So it definitely works for jump starts but it’s not going to provide you with a miracle.I have also taken this battery on a few camping trips. Its solid, rugged design makes it much better suited to tent life than are those slim portable batteries designed for business trips. It also has a decent torch built-in, and you can never have too many of them when you’re camping. I’d estimate it can recharge a modern iPhone from almost dead to full approx three times along with occasional use as a torch – so it can supply a family for a night or two, provided the kids are round the campfire not hiding in the tents on their iPads. You probably wouldn’t want to use it heavily for camping, as like any battery it may degrade to the point where the primary car start function fails, but it’s a nice bonus.I’m pleased with this purchase. It’s a handy device to keep in the boot of your car at all times and has the bonus capability of providing battery power outdoors. Even if you have other cars around, it’s easier to use this than traditional jump leads: you don’t need to move two cars close enough for the jump leads to reach, or open two car bonnets.