S ZEVZO ET03 Car Jump Starter 4000A Jump Starter Battery Pack for Up to 8.0L Gas and 7.0L Diesel Engines, 74Wh Portable 12V Jump Box with USB Ports, LCD Display, Storage Case, and LED Light

every owner that has a vehicle should keep one in their vehicle. Simply use, powerful and compact.

Smaller than I expected but works well. Started a Subaru Outback with a completely dead battery. But its internal battery power went from 100% to 40% During the starting process, so the advice in the user manual to make sure it is fully charged before trying to start a car with a dead battery is best heeded. I did note that when I went to recharge it after the dead battery start, it had rebounded to 85%. If you have USB charger that can provide 9 volts 2 amps, it recharges pretty quickly. If you only can provide 5V, it will take quite a while to recharge. Overall, I am quite pleased. It is compact and easy to use, and it works!

Great product for the price! Compact with good quality. Came with 75% charged so it worked immediately after it arrived.

Just used once, but it worked like a charm for my Mazda. Started fully charged, was at 66% after one brief use. OK, but it worked a lot more easily than my jumper cables. No need to be physically close to the starting engine, so way easier to use on a busy street. It's just way easier to use than jumper cables. Comes with a nice carry case. It recharged to 99% in about 3 hours

I used it to jump my car (sedan) this morning and it worked like a charm. As a matter of fact, I used another card and traditional cables and my car wouldn't turn over. Once I strapped this on, it worked perfect. I am recharging it now and it does take a while, but if you let it recharge over night, I bet it would be fine. Instructions could be a bit more clear but fairly understandable. The cable length shouldn't be an issue, but I can make an argument for them to be longer. The best thing about it is the carrying case that comes with the cords and how fast it worked to make my car start.

I bought two of these for my vehicles. The packages were sturdy and the product looked well made. They charged easily and have both held 100% charge since the initial charging. I used one of them this morning to start a diesel tractor (small engine) that had not been started since last summer and had a dead battery. It started easily and used about 15% of the charged capacity (still has 85%). I would definitely recommend these. They beat jumper cables hands down for a quick start of a dead battery.

Works well and battery remains charged for several months. Used it once after not being charged for 4 months on a 4 cylinder diesel. Started right up and only used 40% battery. Small size that fits well in a glove box.

I fiddled with a couple of wrenches and decided there was just no way I was going to extract the dead battery out of my car. Crummy-looking jumper cables were $36. at Walmart; for just a few dollars more I had Amazon deliver this little marvel, and within minutes I was driving down to Advance Auto for a reliably overpriced new battery. Wow, this Jump Starter works great, and it's lightweight and comes in a nice case. Very nice addition to the "emergency" equipment for a vehicle.