GOOLOO GP4000 Jump Starter 4000A Peak Car Starter (All Gas,up to 10.0L Diesel Engine) SuperSafe 12V Lithium Jump Box,Auto Battery Booster Pack,Portable Power Bank with USB Quick Charge and Type C Port

I had battery booster that suddenly quit working because it couldn't be recharged. That item now costs $300 so I looked into others and found that this GOOLOO booster would probably suit my needs for less than a third of the cost.When I received the product, it was so small I was thinking that I had fallen for some scam advertising or a cheap product that wouldn't work more than once or twice. Boy, was I surprised to find out I was entirely wrong.Unfortunately I've had to use it several times already since I purchased it. Nearly every time it fired up the car better than the fairly new battery in the car does when it is fully charged. I've used it several times in a row without a recharge and each time it provides all the power needed. That's proof that it doesn't need to be recharged after each use.The only time it failed to get me started was when my battery had been discharged to 0% - totally dead. But that's to be expected and the instruction are clear that it is not intended to do this and will not start a car with a fully discharged battery.The booster comes in a very nice and attractive carrying case which would probably fit in most cars' glove box.What I don't like about the unit is that the cables are separate from the booster itself and must be plugged into the unit before each use. At night this can be very difficult to find the receptacle and align the plug. The instructions prescribe a certain sequence for connection too which I do not recall at this time. You must either plug the jumper wires into the unit first or connect them to the car first before turning the unit on. I can never remember the sequence and it is not printed on the unit itself as a reminder. I haven't noticed any difference in the way it works between the two methods so lately I have been plugging the cables in first and then attaching the positive cable to the battery followed by the negative. When I do this the unit powers on by itself and is ready to go.Another complaint is that it is difficult to repack the unit, battery cables and accessory into the nice little carrying case so that you can zip it up closed. There are two or three compartments in the bag for stowing the items. It would be much easier if there were only two (one for the unit and cables; the other for accessories) or none.Recharging is done via USB so you can readily plug it into your car's USB port or use an adapter to use the car's power outlet. Then as you drive along it will recharge the unit. That's convenient because then you will always have the unit fully charged and you won't be forgetting at home or office because you left it there to recharge.So, there are some things that could be better but for a savings of more than $200 it still does what it is meant to do - jump start your car - as well as any fancy high-priced unit on the market. In fact, the battery went dead while my car was in the garage for an inspection sticker. The owner used my unit to start my car because his was not fully charge and was too inconvenient to get to.I recommend this product base on personal use and great results.

Bought this thing 5 months ago, charged it, put it in the trunk. Today I had to use it (listening to the radio for several hours while waiting for my spouse). SO SIMPLE, hooked it to the dead battery and then cranked the car up. Worked like MAGIC! Engine spun just like the car battery was fully charged. DEFINITELY glad I had this thing and so happy I didn't have to hunt down someone to get a jump, even if I did have cables. You NEED one of these!

I've had this jump starter for over a year and have jump started several vehicles with it - so far it has not let me down.It is small and lightweight, and fits easily under the drivers seat of my car. It comes in a rectangular zippered hard case which has a small "footprint" - it doesn't take up much space. It comes with a USB C charging cable, has a couple of USB out ports, and has a handy built in flashlight.To use the jump starter, plug the cables into the side of the unit, connect the red cable to the positive + battery post, and the black cable to the negative - battery post, or a suitable ground. Pust the "Boost" button, and start the vehicle. The jump starter does have "reverse polarity protection" in case the cables are connected to the battery backwards.The only thing I don't like about the jump starter is minor - it takes a couple of hours to recharge using the provided USB C charger.Overall I give this jump starter an "A+"

Honestly I wasn't so sure about this, and it's capabilities. But man, it's jump-started so many of my dead batteries already. Jumpstart my dead lawnmower, my truck, multiple other vehicles of those I've helped stranded on the interstate. This thing is handy and Works well. Easily portable with it's carrying case & the instructions are clear and easily operable that it's a safe product to buy for the family vehicle owners!

Overall it works great for the price and comes with a nice case and accessories. It’s lightweight, portable, easy to use, and easy to charge. The battery isn’t too bad for its size and price, I’ve had minimal issues jump starting even my 36’ diesel pusher RV with a Cummins diesel engine in it or the heavy equipment at my job.My only complaints are sometimes the battery drains a little faster than I’d like, the “smart switch” plug for the cables only stays on for about 30 seconds at a time when using the override/maximum battery boost feature, and once it reaches 50% it’s near impossible to start anything with a dead battery/high current draw due to the smart controller in the cables forcibly cutting the power. This can be very frustrating at times with the 30 second timer and the override that greatly reduces starting capabilities at or below 50% battery power.

Peace of mind knowing I have this with me if the need arises. Works as described. Reliable and easily charged. Easy to follow instructions for use.

I have already used this on a truck and a mower. Works perfectly! Really can't believe how much power it has in a small package.

This battery booster made life a lot easier. No more jumper cables, no more danger of sparks or fire. As I recall, it will crank 10 L gas motor or 7 L diesel motor. It has never failed us, hols a charge for a pretty long time, although I keep it at 100% most of the time. Sure, when it’s cold, it doesn’t have the juice it does when it’s warm, but still, it has never failed me. Or others who called for help. Get one. Be a hero. Rescue people. Make yourself feel good. I think I got mine for 100 bucks. Well worth it….oh, by the way, read the manual, it’s simple and easy to use as long as you use your brain, too. Good luck.