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

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.

I’ve been using the NOCO Boost GB40 1000A UltraSafe Jump Starter for a while now, and it’s one of those things you’re really glad to have when you need it. It’s compact but surprisingly powerful—I was able to jump a dead battery quickly without needing another vehicle. I love how straightforward and safe it feels to use, especially with the spark-proof connections and reverse polarity protection, which takes the stress out of it . It’s also nice that it doubles as a portable charger and has a built-in light for emergencies. Overall, it’s a reliable, no-fuss tool that gives real peace of mind to keep in the car

Small, lightweight, long-lasting charge, works great, peace of mind so prepared for emergencies. Takes way less space than traditional jumper cables and safer to use since does not require assistance from others (stranger on side of road!).

Really solid emergency tool to keep in the car. It’s small enough to stash in the glove box but powerful enough to actually start a dead battery fast. Super easy to use—just plug it in and the safety features basically guide you so you can’t mess it up. It feels well-built and not cheap, and I like that it doubles as a phone charger and has a flashlight too. Definitely one of those things you hope you never need, but you’re really glad you have when you do.

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 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!

A great tool and it holds a charge for a long time. Good size and easy to use, I’d recommend it to anyone. Also, the jaws on the leads are very sturdy and better than the one o got off the snap on truck!

The NOCO Boost Plus GB40 is one of the best purchases I have ever made. Now, three more members of my family have one. I purchased one for my motorcycle since sometimes I don’t ride for a while due to travel or weather. This gives me peace of mind knowing I can start the motorcycle no matter what. I once had to use it when commuting from work because I didn’t notice I had left the flashlights on all day. Eventually, I ended up getting a GENIUS5, also from NOCO, to keep my battery charged. Since then, I haven’t used the GB40, but I still keep it in my pannier, charged just in case. I was so happy with the GB40 that I recommended it to a family member. They got it and, fortunately, didn’t need to use it. Then, on a recent trip to visit them, one of their cars had been parked for a couple of days with some lights turned on. The battery was completely dead, showing less than a Volt on a multimeter. Of course, the NOCO starter didn’t recognize the battery as it was too low. We used the boost mode and were able to start the car with no issues. My family was so happy with the result that they bought two more to have one in each car. What I like: It has safety checks to prevent sparks, shorts, and reverse polarity (this also detects the voltage on the battery, which means if the battery has very low charge, it will fail to start in the normal mode). The boost mode disables all safety checks and works similarly to using cables from one car to another. This is a bit risky and you don’t want to use it often, but when you need it, it’s a relief to have. The cables are short and seem of good quality. The crocodile clamps have a firm grip without damaging battery connectors. It’s not bulky; I keep mine in one of the motorcycle panniers and it doesn’t take up much space. I probably should have bought the GB20, which also has the boost mode but is cheaper, and for a motorcycle would be more than enough. However, I vaguely remember it was not available when I got mine. I don’t regret it, though, as the GB40 can start a motorcycle (even a car) several times before needing to be charged again. You can use it as a lamp or emergency light, and also as a power bank for your phone or any other small device. What I don’t like: Storing it in the provided bag works but feels a bit messy. Other models, such as the GB70, can accommodate the clamps on the starter, which seems much cleaner. There is a case you can buy, but that will consume space, which, in my case using a motorcycle, is not much of an option. The boost mode is not really a boost, just a safety-disabled mode. I don’t like when companies use misleading names just to have a selling point. About the specs: I have no way to verify the claimed specs in the description, such as the 1000 Amps of discharge, but from a user’s perspective, it works with cars and motorcycles with no issues, even with flat dead batteries. In conclusion, I think this is a must-have. Hopefully, you don’t need to use it, but like insurance, you’ll be really happy to have it if you ever find yourself in a situation where you need it.

​Propriétaire d'un Peugeot 5008, j'ai été confronté à une batterie un peu faible avec le mode "économie d'énergie" qui s'activait sans cesse. Le NOCO GB40 à réglé le problème en quelques secondes, seul bemol les cables sont assez courts . A voir au fils des ans sont efficacité déjà démarrer 3 véhicules sans rechargement ​Efficacité immédiate : Malgré le gabarit du véhicule et l'électronique embarquée très sensible de chez Peugeot, le booster lance le moteur instantanément sans aucun message d'erreur au tableau de bord. ​Petite précision : Sur le 5008, l'accès à la batterie peut être étroit. Les pinces NOCO sont fines mais très robustes, ce qui permet de bien mordre les cosses même quand l'espace est limité. ​Sérénité pour les vacances : Avec une voiture familiale souvent chargée avec les enfants, tomber en panne sur une aire d'autoroute est un cauchemar. Ce petit boîtier retire un gros stress. ​En résumé : Testé et approuvé C'est un outil de qualité semi-professionnelle qui rassure toute la famille. Je recommande à 100% . ​💡 Le petit conseil en plus pour votre 5008 : ​Sur certains modèles de 5008, la borne négative (—) de la batterie est difficile d'accès car elle est reculée sous le pare-brise. N'oubliez pas que vous pouvez brancher la pince noire du NOCO sur une masse métallique du châssis (un gros boulon non peint sur le bloc moteur par exemple) cela à même fonctionné en rajoutant une rallonge car ma masse négative etait trop éloigné 👍

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!

Doet gewoon wat het zegt

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.

يؤدي عمله بشكل جيد