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

Overall, I have been very impressed with the NOCO Boost GB40 as an actual jump starter. When charged and ready to use, it has worked reliably for me multiple times over the years and has successfully jumped my vehicle without much trouble. The compact size and portability also make it much more convenient than dealing with traditional jumper cables. The biggest issue I have experienced is long-term battery retention during storage. I would fully charge the unit to 100% and keep it in my trunk specifically for rare emergency situations, but because those situations are thankfully uncommon, I would often discover that the internal battery had completely drained by the time I actually needed it months later. In practice, that means this works best for people who either: regularly maintain and recharge the unit, frequently use it, or own vehicles that commonly need jump starts. If you are expecting to charge it once and forget about it for extremely long periods, you may want to check the battery status more regularly than expected. I also occasionally tried to use it to help other stranded drivers, but the same issue sometimes came up where the unit had already self-discharged from sitting unused too long in the trunk. To be fair, I do not know how much of this is normal lithium battery behavior versus the device itself, especially considering temperature changes inside vehicles over long periods. But it is still something buyers should realistically know before relying on it as a long-term untouched emergency backup. Overall, I still think it is an excellent portable jump starter and a very useful tool when properly maintained and kept charged. I just recommend periodically checking and topping it off instead of assuming it will stay at full charge indefinitely in storage.

This booster is one of those products you hope you never need, but you’ll be so glad you have when you do. It’s compact enough to keep in the trunk or back seat without taking up much space, yet powerful enough to quickly jump start a dead battery with no hassle. I love how easy it is to use, even for someone who isn’t very car-savvy. The instructions are simple, the clamps feel sturdy, and the safety features give extra confidence when connecting it since I know I won't damage my car or harm myself. It saved me from having to wait for roadside assistance which is AMAZING! Overall, this little jump starter is absolutely worth it. Reliable, convenient, and a real lifesaver when you need it most.

I’ve been very satisfied with this jump starter. It has a compact design that makes it easy to store in the vehicle, while still being powerful and reliable when needed. It has already come in handy twice when my battery was dead. Overall, it feels well-built and dependable.

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.

I bought this portable starter hoping to use it in my work with cranes, but in my experience it has not been the best option for large vehicles or heavily discharged batteries. With its 1000 amps, I think it works best for cars, light trucks or occasional emergencies. What I liked the least is that the battery discharges relatively quickly, especially after a few uses. This forced me to be aware of recharging it frequently to make sure it was ready when I needed it. In its favor, it is compact, easy to transport and the integrated flashlight is practical in night situations. For private drivers or lighter vehicles it can be a good backup tool, but for heavy work with cranes and frequent starts I would recommend looking for a model with greater capacity and amperage.

Perfect gift! Easy to use. My teens and I have used this many times to help others or ourselves. Great piece of mind for your loved ones to have in their vehicle. Easy to recharge and holds charge over time when not in use. Highly recommend.

Worked great. First time using jumped a Toyota Tundra with a 5.7L. Battery was so low dash lights wouldn't come on. Hooked up hit the override button and engine started up. Unit still shows a full charge.

This review is for: NOCO Boost Plus, Model GB40 ============================ Short Version: I love this device and will likely never go without one again. It's a reliable and easy to use jump-starter, power bank and 7-position flashlight all-in-one, so what's not to like? I would recommend this NOCO device to anyone who owns a car. Consider it one-payment dead battery insurance with no wait, delays, or co-pay. ========================== • MY EXPERIENCE: My car developed a short in the door lock mechanism that drained the battery in less than 24 hours. Between the inept Ford dealership and the excellent local private automotive shop, It took 5 weeks and several visits to trace and repair the short. In the meantime I needed a reliable way to jump-start my car on a nearly daily basis. After searching Amazon, I purchased this jump starter based on the overwhelmingly positive reviews. And it has really served me well. It was used multiple times between shop visits and has been used multiple times since then. It has been reliable when needed, jump-starting cars with ease. The Li-Ion battery holds a charge for a very long time. After sitting on the shelf for over 6 months it still appeared to hold nearly a full charge. And then only took about an hour to top it up. I've carried jumper cables in my trunk my whole life, but when a jump is needed you can never be certain someone will come along who's willing and has the time to assist you. This powerful jump-starter eliminates that uncertainty. It's also very easy to use and makes a great present for friends and family - even those who aren't very mechanically inclined. • USEFUL LIFE & RECHARGE FREQUENCY - From NOCO, when answering a question here on Amazon: 'The Boost should last several years with regular use and proper storage. To help extend the life of the internal battery, use and recharge at least every couple of months.' - Not everyone will have a need to use this device as a power bank, so the battery won't get properly charged and discharged as described. In that case my suggestion is to use the NOCO every month or two to charge your cell phone. - From NOCO, in the Important Safety Warnings section of the instruction manual: 'To ensure maximum battery life, avoid charging your product for more than a week at a time, as overcharging may shorten battery life. Over time, an unused product will discharge and must be recharged before use. Disconnect the product from power sources when not in use.' • FEATURES: - Powered by a (non-replaceable) 12v 1000A Li-Ion battery. - Battery Connection Safety -- 'Safely connect to any 12-volt vehicle with our mistake-proof design featuring spark-proof technology and reverse polarity protection' - Has a Manual Override, which allows the unit to jump start a battery that is discharged below 2v. - Also serves as a USB connected Power Bank - Includes a 7-position torch light • CONNECTIONS: - 12v Out - The included battery clamps are to be connected here. This is a unique connector so you cannot connect the jumper cables stored in your trunk directly to this device. - USB In - The included cable, or any USB to micro USB charging cable can be plugged in here in order to charge the NOCO jump-starter battery. The power rating of the charger device will dictate how fast the NOCO will come to a full charge. - USB Out - Let's you use the NOCO as a Power Bank (5V, 2.1A), using a standard USB cable. • RECHARGING - Time needed to charge the NOCO - The following comes from the User Manual. Assuming a nearly or fully discharged NOCO GB40: Charger (source) Rating = Full Recharge Time. [.5A = 12h], [1A = 6h], [2A = 3h] • EASY TO USE: 1. Plug the clamps into the NOCO. 2. Connect the clamps to the car battery. 3. Press the NOCO power button to turn it on. 4. Start the car. 5. Press the NOCO power button to turn it off. 6. Disconnect the device from the car battery.

Mit dem NOCO Boost GB40 bin ich sehr zufrieden. Das Gerät macht einen hochwertigen und durchdachten Eindruck und gibt ein gutes Gefühl, es im Auto dabeizuhaben. Gerade als Starthilfe ist so eine kompakte Lösung sehr praktisch, weil man im Ernstfall schnell reagieren kann, ohne auf fremde Hilfe angewiesen zu sein. Positiv ist außerdem, dass das Gerät handlich ist und sich gut verstauen lässt. Auch die Bedienung wirkt unkompliziert und alltagstauglich. Insgesamt ist das eine sehr praktische Kombination aus Starthilfe und Powerbank, die ihren Zweck zuverlässig erfüllt. Für unterwegs oder als Sicherheitsreserve im Auto aus meiner Sicht eine klare Empfehlung.

Excelente, Equipo, es de buena calidad, se carga muy rápido. Muy confiable.

Verkar vara en rejäl produkt. Fick stopp på bilen i helgen och var tvungen att tillkalla assistans, men fick vänta i två timmar. Hoppas att jag slipper använda den, men nu ska jag väl kunna lösa det själv i så fall.

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.