Porta-Jump 91300 Emergency Jump Starter

Has more than paid for itself by saving roadside service calls plus the time and inconvenience it has saved... a great back up for when lights are accidentally left on and drains the battery too low to start the vehicle. Requires a functional lighter to work.

BTW, not meant to use for a bad battery that will not take a charge; only for situations where your battery still takes a charge but is run down ie by a light left on or a loose/corroded battery terminal, etc.

I bought one of these in a store about 3 years ago (I've forgotten which automotive store it's been so long). I had a number of instances back there where I needed a jump, and I loved those little kits the triple AAA guys carry to jump cars, much easier than involving another car. So when I saw this in the store I had to buy it. I admit the entire time I've had it I was skeptical it would work. But fortunately I've not had occasion to use it, until today. I remembered that I had this in the back, and despite the package saying a 5 year lifetime, I was not at all confident that it would work after this long. But I opened it up, followed the little instruction list on the back of the battery, and sure enough 10 minutes later my car started right up. The thing paid for itself because triple AAA wanted to charge 35 dollars to come down and jump us. Totally glad I bought this thing.

And like other reviewers have said, this won't help if you have a piece of crap battery in your car. Even normal jumping won't get you far with a lousy battery that needs replacing.

Another thing: Make sure you have some strong scissors in the car to open it, or take it out before storing in the car. I was lucky I was at a library at the time, and could borrow a pair. They make the plastic packaging on these things very strong.

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It will only work if the Battery is low because of leaving the headlights on.

It will not work if the battery is bad such as having a bad cell, bad starter etc.

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Bought one from local Target store a few months back and leave it in car just in case one day I might need it. Yesterday, my neighbor came and asked me for help to jump start his car (Mercedes-Benz ML320, SUV). Car won't start because he left the lights on and drained out most of the battery power. Battery still has enough power to unlock doors and roll down windows.

Tested the battery with PortaJump and got a green light, meaning the battery is ready to accept new charge. Connected the PortaJump power pack and left it for 10-minutes.... car still will not start. I did notice the battery has more power after charging it with PortaJump, but it did get not enough cranking amp to start the car.

Eventually, I have to help my neighbor jump start his SUV the old fashion way.

PortaJump is very portable and rechargeable, but it may not work for cars/trucks that needs a lot of cranking amps.

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I was skeptical at first, but I bought it anyway because I liked the idea, and thought it might be worth it. I left my lights on one day while I was disc golfing, and of course my battery died. I plugged it in, and my car started 10 minutes later. Make sure you read the directions. The car has to be in accessory mode for the Portajump to charge your battery.