Boost GB20: 500A UltraSafe Jump Starter Power Pack – 12V Car Battery Booster, Portable Power Bank & Jump Leads - For 4.0L Petrol Engines

Purchased for personal use but ended up using it for work, never thought it would be as good at it actually is. outstanding little jump pack small and compact light weight Been using it for 18 days approximately jump starting various sized batteries ranging from 420 amp up to 760 amp no problems at all. Have to charge after approx 5 jump starts highly recommended for the price.

Car had a dead battery , Not for the first time as I barely use it. Bought this and it arrived the next day, despite not being a prime customer. Jump started my car without me having to charge the device first. It was really simple to use. I am really impressed with it. Only downside was the charging cable, I did not have a plug to fit it, But after a rummage through my cable stash I found one that fit it which had a usb end so I can charge it. Overall a very handy little device to have.

I literally never write reviews but this thing is so perfect and exactly what I was hoping it’d be that I had to give it 5 stars. I bought a Honda CBR600RR and as I park it on the street I decided to install a GPS tracker on it. Works great but if I don’t ride the bike for a few days the battery will be completely dead. (I’ve probably installed the tracker wrong, I have zero mechanical experience, which should be another plus point of how easy this battery pack is to use) Battery kinda dead: you hook it up to each terminal with the supplied clips, turns on instantly. Battery completely dead: there’s a safety feature that won’t let you press the boost if it can’t detect a battery, if you know it is hooked up you can just override that by holding the button and bam, works instantly. I’ve had to do both a couple times and honestly it’s so easy. One of the most spot on perfect products I’ve ever bought. I carry it in my backpack when I’m riding just in case I need it. It’s so easy to use. It takes me longer to undo the screw on my seat to access the battery than it does to turn the bike on with the battery pack. 5 stars but I’d give it more if I could. Also I charged it to full power when I got it as instructed and it’s started my bike multiple times so far and I’ve not had to recharge. There is a battery indicator so you’d know when it needs charged anyway.

I have a car with an intermittent fault which means I'm never sure whether the battery will be charged or flat. Most of the time it's fine but, every now and again, I find that it's just dead. An auto electrician has said that I need to leave the car with him for about a week so that he can test it every day. Presently, I can't do without the car for a week. He's done a couple of checks but could find no fault. That's why I carry one of these. The previous one got hot in the car (remember the heatwave?) and swelled so I had to dispose of it. I've had this a couple of months without needing it but was very glad I had it when I went to the car to find it had no power. The central door locking didn't work, the dash lights didn't come on and everything was dead. Luckily, I had connected this unit to the mains for about six hours when it arrived to fully charge it. I connected up the booster, remembering to switch it on, turned the ignition key and the car started first time. I was impressed. Even more so when, after a short drive to get fuel, I found that the car still didn't have enough energy in the battery to start. I connected the unit up and it started easily for the second time. My car has a 1.4 litre petrol engine. I checked the remaining power on the colored LED display and the green was still lit, indicating there was more power immediately available if I needed it. It was a little costly but very effective and gives me complete peace of mind. Overall, I'm happy with my purchase.

Worked perfectly. Highly advise to read the instructions (you need to scan the QR code on the booklet provided to see them). Battery unit itself is very sturdy and looks to be at least splash resistant to a degree. Used to jump start my car and worked immediately. I would call out that the jump leads are not as long as I anticipated. Not a problem for me as my vehicle has a small engine bay, but for those with larger vehicles where the battery is in a accessible location and the manufacturer position jump start points in the engine bay with positive and negative far from each other, the leads MAY not reach. A very niche scenario but can still happen.

If this was a battery held together with duct tape that only worked once I would have saved on the £150 weekend callout fee or the £70 weekday fee. This works, it is solid and good quality, and I never need to worry about future dead battery issues when at home or on the road.

small, light and compact. so easy to keep in your emergency bag in the back of your car. looks and feels like a well made quality product. came out of the box nearly fully charged so I have no idea how long ago it was made but by all accounts they hold a full charge for around 6months. charges with USB C and comes with a cable so can be charged in the car on a long journey. good value during the Black Friday deals. good peace of mind having it in the boot going into winter. cold weather kills batteries.

Does what it says on the tin

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Fantastic bit of kit. Got it for a quad and ride on lawnmower that have dodgy batteries that don't charge too good. Works perfectly.

High quality product!

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Great piece of gear, goes everywhere, fits under the seat of my motorbike and I have a bigger one in the 4wd, take them everywhere with me. I have been able to help so many people, more convenient than jumper cables.