If you have read the other reviews, you know that there is some debate over whether this works or not. Having tested this product, I will say that almost everyone is right on both sides of this debate. This is because there is confusion about what this product actually is and what it actually does. It is probably improperly described as "jump start" device. When you hook jumpers to your car from another car or from a portable jumper, electricity is sent to both the discharged battery and the engine. When the electricity goes to the engine, it allows it to start by sparking the gasoline. This product does not do that and is not designed to do that. So, technically, you cannot jump start your car with this. However, this does not mean that it will not help start your car if your battery is dead. This is because this is actually a battery charger. When you hook up Mighty Jump to your lighter, it is supposed to start recharging your battery. The electricity it is sending through the circuits to your battery is not enough at any moment to start your engine directly, but it is charging your battery. After 10-15 minutes, your battery may very well have enough current to start your engine. So, technically, it is correct to say that this will not work to jump start your engine. It could though recharge your battery, and this could very well get your engine to start.
This will only work though if your battery is capable of holding a charge or being recharged. If it is old and needs replacing, this product will do nothing for you. On the other hand, if you leave your lights on for a few hours and your car won't start, this could very well be enough to help you get it started.
Do you I recommend this? Only if you have a good battery and you can get this at a good price.
Do I recommend that you buy a more expensive portable jump starter instead? From my experience, they are not very reliable either. They are essentially just rechargeable batteries, probably very similar to your car battery. That means they will wear out relatively quickly. For the price, you could probably just replace your car battery. For that reason, the Mighty Jump at a smaller price point is very tempting.
In general, having a set of jumper cables would be your most reliable option particularly if you live in an urban setting with a lot of people around. If you are out in the middle of nowhere regularly, you might want to invest in something more versatile (and more expensive).
If you can get this at a good price, it would be a good option for just running down your battery from leaving your lights on. If you suspect that your battery is bad or is getting old, this will do nothing under those circumstances.
Sabre Rattler and G. Mahler (commentator on Aquabusa Jib's review) comments are the most informational and accurate.
For any jump starter to work (including the Mighty Jump) the following conditions must be present:
1. The battery in the jump starter must be in good condition and kept charged. This is needed to charge up the car battery.
2. The accessory (lighter) socket must be in the "ON" position and the connection is good all the way to the car battery.
3. The car battery must be capable of retaining the charge from the jump starter. That is it must not be too old or incapable of holding a charge.
4. All devices using battery power (eg Head lights, rear window heaters, radio, cabin lights etc) should be switched off so as not to drain the limited battery power available.
5. Wait for the car battery to be recharged sufficiently to provide the cold cranking amperage that Aquabusa Jib mentioned in his review to start the car. This may take between 1 to 10 minutes depending on the battery power in the jump starter and how discharged the car battery is.
6. The car should start now (unless the starter motor on the car is dead!). Do not switch off the car engine during the first 15 minutes of driving to allow the car generator to at least partially recharge the car battery.
Remember to recharge the jump starter battery after use so it is ready for the next emergency. It can be achieved by leaving the jump starter connected for about 15 to 20 minutes while you are driving. It is good practice to recharge the jump starter battery at least every 3 4 months. All rechargeable batteries deteriorate over time and need to be replaced after a few years. It is time to replace when it will not hold a charge for at least a few days when not in use.
Jump starters do work if used correctly.
Hope this helps some people.
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This product works fine. People need to READ the instructions and do as directed. I noticed many people have commented that they only wait 5 minutes for their battery to recharge. The directions clearly state to wait 10 to 15 minutes. Also, be sure your ignition switch is turned to the 'Accessory On' position. Otherwise, no electricity can flow to the battery. Do NOT leave the Mighty Jump in a car when the outside temperature plumets below zero, or it will lose its charge too. Bring it inside to keep it warm. Another tip. If your battey is old or not holding a charge properly, it's time to get a NEW BATTERY. It's not Mighty Jump's problem. PLEASE READ AND FOLLOW THE DIRECTIONS. Don't be so quick to blame Mighty Jump. 99% of the time it is the owner's fault, not the product.
Read Best Reviews of Glove Box Car Jump-Starter Here
Do NOT waste your money!!! I bought 3, one for me, one for my mom and the other for my sister. My mom had to use hers, it didn't work; I bought mine and it didn't work! THIS IS JUNK JUNK JUNK!!!
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While driving home my battery light came on. I was able to get the car home. I turned the car off than tried to restart the car and nothing happen. when I told my roommate what happen she gave me the mighty Jump to try and jump start the car to go get a new battery. I had the might jump connected for 5 min and the car started right back up. I turned the car off and than back on but sadly it died again. I had a bad alternator. The main point of the store is that it charged my battery up enough to get it started. Which means that the product does work.
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It's a better charger than the one I ordered for the house. It seems to fit better and my phone stays charged longer.
