autowit SuperCap 2 12-Volt Battery-less Portable Jump Starter (Up to 7.0L Gas, 4.0L Diesel Engine) Built-in SuperCap, No Need of Regular Charge, 10 Years Lifespan, Extremely Weather Operating

Nachdem schon 2 Powerbanks versagten bin ich mit dem -immer funktionierten- Starthelfer - auf der sicheren Seite

Good solid build, draws it's power from the flat battery. So if your battery goes flat and no one else is around it could be a live saver.

Simple et efficace

Bought this several months ago after I left the lights on my car and had to get a jump from a stranger. I didn't want to deal with the embarrassment of asking someone for help, so I looked up alternate ways to charge my car battery.I then remember an old video by Scotty Kilmer who highly recommended this product. It looked like a gimmick, but judging from the hundreds of glowing reviews about this, I got it.Looks like that battery was on its last legs - 3 months later, I was doing an errand, went to start my car... nothing. Heard the solenoid trying to engage and that unpleasant clicking noise.So I busted the Autowit out. Read the instructions - very easy. Plug the blue side of the included jumpers into the supercapacitor. Match the red to red, black to black. Wait about 3-5 minutes (my battery went from displaying 11.6V all the way down to 10.2V as it was charging). When it hits 100%, it beeps to tell you it's done. You hit the red button on the thing to start the discharge process. It beeps for 10 seconds giving you enough time to get in your car. Once the 10 second countdown is done, it'll do a long beep as it discharges the supercapacitors. Start the car during this period and bam. It's like the battery never died.Next day, I figured the battery was bad and I needed to get it replaced. Well, lo and behold, the battery proved me right - car refused to start up again. Same thing, pulled it out of my trunk, hooked it up, same process, car started right up. Went to my local Sam's Club to have it replaced and now I'm happy as an oyster.No batteries - officially rated to be stored between -48 to something like 130 degrees Farenheit. If your battery is so flat it can't charge your SuperCap 2, it also includes both a mini USB cable you can hook into any computer, phone charger, or power banks you take with you. It also includes a 12V cigarette charger. If you have a spare car or you know a friend is nearby but they don't have jumpers, you can simply plug it into their cigarette lighter and it'll charge itself in just 3 minutes.It's a bit pricey, but I'm willing to pay that price. The non-Lite version is nicely rubberized, built tough. It comes in a handy storage case that contains all the wires you need and of course the instruction manual. The presentation on this product *exhumes* quality. You get what you pay for folks. I recommend this to all my friends and family.

Slower to charge on usb than advertised