Portable Car Jump Starter 4000A: 12V Battery Jumper Emergency for 10.0L Gas Diesel Engines, Power Booster Start Boost Charger, Intelligent Protection, USB-A Type-C Ports with mutifuctional Light

Just had a chance to use it for the first time this morning, on someone else's car. It was very simple to connect up and the car with the gutless battery started first time. Very impressed and pleased that I had it. I bought this neat little device to carry around in my EV just in case the 12v battery on that failed (which it never has) and also so that I could jump start other people's cars (I always carried jump leads in the past for this reason, but the EV's 12v battery can't be used with those). I've yet to try starting a car with a completely discharged battery but that seemed like a pretty important feature when I was considering which jump starter to buy. Pros: Simple to use, plenty of power capacity, seems to be solidly built, packs into a tidy little case, has potentially useful additional features (emergency light, powering coolbox, charging phone etc), holds its charge for a very long time when not in use and is very good value for money. Cons: None

Really good bit of kit! Cheap for me in sales but I would pay full price it’s worth it! Fits under my seat, charges in couple hours, seems to last but I don’t need to use it only for emergencies, torch light is handy! All rounder works. Easy to use.

Item arrived with about half a charge, after fully charging it used it on a 1.8L Ford Focus with dead battery. Connected clamps and tried to start engine. For a second it didn't sound it would work but then it fired up. After disconnecting still showed full power. The battery unit does feel plasticy but still seems sturdy. The clamps feel heavy duty with a strong spring action. The carry case is semi hard, not blow moulded but stiffened material. Zip doesn't look the best. Large bottom section for battery with elasticated strap to hold it in place. Zipped netted area in top which holds clamps and other accessories. After single restart, item worked as required. Haven't tried compressor function. Will update as and when it gets used in future

Not used it yet but looks like it’s going to be a nice bit of kit

haven't been able to fault it so far. I've had this charger many months and used it a few times. it holds a good charge, you can get at least 3 jumps before needing to recharge it. so it functions well. it is very sturdy and it has a very good case containing all the leads you need and a 12v plug.

I Have Purchased 3 Other Jump Starters over The Last Month, And had to Return them for A Refund because they Hardly turned the engine over, and Didn't Work ! This Particular One is 100% Brilliant and Started My Car With A Flat Battery Instantly, and used Hardly Any Power ! Proven Quality, And Would Highly Recommend !!

Great unit, powerful, simple does what it says.

Absolute rubbish. At First I thought that this was a great device - it charged well, it has a lot of functionality (flashlight and USB charging as well as a 12v car socket that you can plug into the jump pack). I fully charged it when I got it and took it out of my car once to top it up after a few months. Recently I had need to actually use it to jump start a car and immediately on plugging it in, the power level started dropping by about 2-3% per second (bear in mind I wasn't even trying to start the car at this point). By the time the key was turned (about 20 seconds after attaching it) the pack was showing about 20%, and this immediately dropped to 0. It didn't even turn the engine once before failing.

Love this thing. Used many times.

we love this it has helped us to start a car a couple of times when lights were left on inside

Easy to use and works like it’s supposed to. I’ve used ours several times.

The power you need, with an excellent case that holds everything, very compact, lightweight and easy to use. Great value for the money. Would recommend it to anyone wanting a road worthy tool in an emergency or just to add air to a car, motorcycle, bike, trailer, or a lawnmower, tire with the auto stop feature. I’ve used all it’s features and so far it’s worked and preformed well.

I love this so much I'm buying another for my son's vehicle. It's very handy. On a whim I went night fishing and used the light to light up the dock area we were fishing on for about an hour and a half. It wasn't super bright but worked great.. The battery percentage only dropped by 2% during that time. A great buy.