KeenPower 6000A Super Capacitor Jump Starter [Upgraded Clamps & Screen Version] – No Traditional Battery, Powered by 6X 3000F Supercapacitors, Works in -45°F Env, 3-Mins Fast Charging for Instant Use

First let me say read the review from Tac Medic..Second, This is the best jump box EVER!! It is made NOT TO HOLD A CHARGE!!! You charge it by hooking it up to the low battery. If that battery only has 5% this will take a charge from that and basically turn that 5% of power into 100% IE enough power to jump start your vehicle. You can charge back to 100% once the vehicle has started but it WILL NOT hold the charge for more than a day or two. This is my second one because people suck and broke into my jeep and stole my first one!! I used my original in all types of weather and all types of vehicles and it never failed. Even on diesel trucks that require you to wait because of glow plugs. It literally took about 3-4 minutes to fully charge and always started the vehicle 1st time if it was actually a battery problem.Read the directions people!! This will not fail you!!

The people writing bad reviews think this unit has a battery. It does not have a battery. It's a capacitor. Capacitors do charge kinda like a battery but they dump all their energy in a fast release. This unit gives a 25 second release of energy which should be long enough to start your vehicle. The capacitor doesn't need to be stored fully charged like a battery jumper. A low car battery will charge your capacitor in less than 5 minutes. Jump your vehicle and put it away. Unlike a battery, this capacitor jumper should last much longer than battery chargers because batteries go bad over time. How often to you replace the capacitor on your pool pump or your AC unit? Thousands of starts every year. You're going to be mighty upset if you plug this in and charge it like a battery pack. It doesn't need to be stored with a full charge. The concept of capacitor jump starters takes some understanding about capacitors. But if you think it will behave like a battery, you'll just write a poor review and send it back. The only draw back would be those who like to charge their phones or iPads like battery chargers do. This is NOT A BATTERY.

Quality craftsmanship,

This is a powerful tool that works great. It is also super easy to use if you take the time to learn and understand this device. Let me say up front this unit absolutely needs longer leads. Cars and trucks today can make it all most impossible to reach battery connections. Now I’ve seen other reviews commenting on how it takes so long to get it charged and it loses its power pretty quickly. This unit is not a battery. Now it does have a small battery for the display and the controls you’ll notice it says precharging is not necessary. This unit utilizes 6 high capacity slow discharge capacitors to do its magic. A capacitor does charge but it is much faster than a battery and it stores more power, until a predetermined event happens and the capacitor begins to rapidly discharge with everything it has. Now multiply this times 6 and that’s how this booster works. Capacitors lose do not retain or hold a charge like a battery does. This is a durable tool that is capable of an almost unlimited number of charge/discharge cycles compared to a battery that is only capable of a certain number of cycles if the conditions are ideal. Temperature extremes greatly affect batteries but have no affect on capacitors. The little display can be hard to read in daylight. I get this is a high dollar item but it should last in theory forever. So in the long run I’d say it’s a good value.

It’s works well ,it starts big vehicles , charges pretty fast via the starter. And is built very well could be a little cheaper though

I have to other Ultra Cap Jumper....this is the best of all. Planning to buy a 2nd unit.

Takes forever to charge via USB but I wouldn't charge anything overnight ,.even my ear buds, so charge it during your waking hours just in case.That being said ,the instructions are terrible, also ,many reviews here don't understand that this isn't a normal battery charger, this uses whatever charge is left in your battery and shoots it back into your battery, well that's my understanding.Check youtube videos on how it works,and make sure you understand what the buttons actually do like the black button and the green button because its very confusing and manual doesn't explain it .Cords could be longer . Plus it doesn't hold charge for weeks.Only get if there's a huge discount or sale,otherwise stay away.

Very good