NOCO Boost GB20: 500A UltraSafe Jump Starter – 12V Lithium Battery Booster Pack, Portable Jump Box, Power Bank & Jumper Cables - for 4.0L Gas Engines

I’ve used the NOCO Boost GB20 twice now, and both times it saved me from what could’ve been costly and time-consuming situations. Instead of calling a tow truck or waiting around for someone with jumper cables, I was back on the road in minutes. It's incredibly easy to use—even if you're not mechanically inclined—and it holds a charge for a surprisingly long time. I charged it once and it sat in my car for weeks before I even needed it, and it still worked perfectly. Recharging it is quick and hassle-free.This jump starter has already saved me money and time, and it’s given me peace of mind knowing I have a reliable backup in my glove box. If you drive a gas vehicle (up to 4.0L), I highly recommend this. It’s compact, powerful, and an absolute must-have!

was recommended by a friend and am super happy with this purchase. in the last 20 months, it has been a champ in helping start two riding mowers and a small truck. compact, easy to use, and very reliable for a great price. i've recommended it to another friend who also raves about it.

Haven't had a chance to use it yet and I hope I don't have to but I am quite sure it will start my Harley if the battery goes dead. It's charging capability is great and the power and the fact it is portable and it's functionality by plugging directly in to my NOCO battery tender port are really great ideas that the company came up with and I strongly suggest buying one if you don't already have one. You don't want to be on the side of the road you want to be riding.

Charges fast and last a long time on the charge

Works great! Used it to start my 3.4L v6 from a completely dead battery. I started it a total of four times on one charge and the battery indicator still showed roughly 75% charge. Super impressed.

The product does work and works good. No issues jump starting a CAN AM Spyder F3 LTD. Very easy to use. The only reason giving it 4 starts vice 5 starts is that the unit's battery does not retain its charge. You almost need to charge the unit weekly or at least check the status. I left the unit unattended for two weeks (no use, no need) but it was almost drained. Compare that with my portable air compressor that retains its charge for weeks on end. If you can remember to check the battery status at least weekly, then it's a good buy. You just don't want to be caught off guard needing it either for yourself or another person in need, and the unit is dead because it's been a week since you last charged it.

Purchased in 2021 and still going strong.Bought a higher version in 2025 for a family member.Pros: Holds a charge for a long time, has been used on several occasions, and doesn't require immediate recharging. The included clamps are compact and rugged. It starts engines far bigger than recommended, though slowly (powerful enough for small engines). The safety features and ease of use are appreciated.Cons: The charging speed for phones is slow. The included bag is flimsy.I'm a proud owner for years, I bought the next model up to start larger engines. I've helped other drivers with off-brand jump starters that are bulkier on several occasions. This relatively compact model has surprised me firing up diesel engines larger than it's rated. A must-have for every driver, and cheap enough to justify.

When I got my starter, I plugged it in to charge, just as if I were charging my cell phone or my e-reader. When the light showed solid green, I threw it in the car with its leads. (By the way: I notice that among those who were unable to charge the starter, all but one of those for whom the information was available were using the model that describes itself as a "Genius" Boost Starter. The GB20 I got did NOT describe itself as a genius.)Here's the beauty of it: you can attach it to your battery BEFORE you turn on the power, so there's no worry about sparks.Left your lights on? No problem. Didn't drive your Prius often enough during the pandemic? No problem.In either case, pop the hood, connect the leads, press the "on" button, get in the car and start it. Get out of the car, disconnect the leads and throw the starter in the trunk or back seat. Drop the hood and drive off. It's easier than having a second car to charge from parked right next to yours.The leads are color-coded, just like jumper cables, and you attach them just like jumper cables, so you don't have to learn anything new.When you press the "on" button, the starter runs a little diagnostic. It is worth reading the instructions. If your battery is terribly low, it might be worth allowing a little time for some electrical charge to run from the starter to the battery, but I've never had it happen to be that low.This accessory has been a must for me with my new Prius during the pandemic, especially during cold weather. I keep the charger near the back door, hooked up and charging. If my Prius doesn't start, no problem. I go back in, get the charger and start it up. In rainy weather, I throw the charger into the hatchback "just in case."I love the safety feature of not having the power on while I connect the cables.I love not having to carry jumper cables with me all the time.I love not having to ask fellow motorists to assist me with a jump.I love the fact that charging the starter is as easy as charging my cell phone.I love not having to wait for AAA to arrive when it's just the battery. (Yes I do keep my AAA membership, not every problem is solved with jumper cables.)I love not having to figure out how to keep a maintenance charger running safely.On the whole, I consider the money I spent on this to be very well spent indeed!