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

It's amazing and easy to use. I've help jump start a few cars,. It's not bulky and fit nicely in the car. Great price, I've recommended it to a few people.

Bought this thing a month ago, charged it fully and kept it in the trunk. Woke up today to a dead battery in single digits temperatures. Rushing to go to work with no time to waste, this little beast started my truck in a single start. Gave it 5 stars for keeping 100% charge through a month of freezing temps, and for working in a start despite the battery being fully dead. It still showed fully charged even after that use.

Amazing charger. I have it now for few years and it has charged my jetski and my motorcycles with no issues.

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.

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!

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.

i have had to use these in the past and they work exactly as they need to when you are in trouble. i have several sizes of this product already, so i bought this for my motorcycle and UTV. they seem to hold a charge for a long time (i check and top up the charge every six months). comes with outlets you can use for small electronics to recharge, but the real use is in the clamps to jump your battery.

I live alone on a lake in the middle of nowhere. Came out there day to a dead battery and ordered this guy! The NOCO Boost GB20 has been one of the most useful automotive gadgets I’ve added to my car kit. This little jump starter packs a surprising punch — it easily starts my 12V vehicles with engines up to 4.0L gas without hesitation. What I love most is how compact and portable it is; it fits in a glove box or backpack, so it’s always ready without taking up much space. Setup is super simple: just connect the clamps, and the LED indicator lets you know you’re good to go. The UltraSafe technology gives extra peace of mind because it’s spark‑proof and reverse‑polarity protected, so even if you clip the clamps wrong (we’ve all been there), it won’t hurt the battery or device. Beyond jump starting, the built‑in USB port doubles as a power bank for phones and gadgets — perfect for emergency charging on the go. Battery life stays strong between uses, and the GB20 recharges quickly so it’s ready when you need it. If you want a dependable, easy‑to‑use jump starter that’s more powerful and safer than a traditional roadside pack, this one is absolutely worth it! Absolutely a great value and gets your car going quickly!