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

I've had a lot of battery jump starters over the years and it's a pain to keep them charged up. I started researching options and found this super capacitor jump starter. Little did I know I would need it that week. My car did not start one morning. I connected it up, let the capacitors charge up to 100%, hit the button, and started my car right up. Tried it on my SxS that was dead and it started it right up. Tried it on my 2006 F450 that was dead...worked great. Tried it on my big Diesel RV with completely dead batteries and.... okay, I will say, it started it...sluggish but it started it....however, the cables were EXTREMELY hot and it smoked a little and smelled like it was burning.... so my only suggestion would be to put bigger cables and better clamps that can handle something like a big Diesel. Yes, I have a lot of equipment that just sits and the batteries die. This is perfect for what I need and you NEVER have to worry about keeping this jump starter charged up. It will use the little juice left in your batteries to pull it into the capacitors. I loved this device so much, I purchased a second one, then a third one for a Christmas present for my parents. I highly recommend this jump starter.

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!!

This product jumpstarted a 2015 Peterbilt 579 with no problem. I would recommend this product.

A little finicky, but it works

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.

I bought this thing on a whim because I like the idea of not having a Lithiom ion BATTERY jumper sitting in the hot car all day (South Florida). Im not one to make reviews until I get to actually test the product and low and behold the battery on my 3.8 liter V6 palisade died on me a week after getting this. There were certain things I wanted info on before buying this so I'd like to relay my answers in case anybody else is interested. 1. I wanted to know how long the charge lasts after charging. I charged it to 100% when received 1/3/26 and kept track every couple of days the percentage. It stayed at 100% for about two days then dropped 2-3% each day. This gives more than enough time to charge then transport to a friend/family member with a dead battery. 2. I also wanted to know if the ability to jump a car at around 5% was true 3. I wanted to know if it could jump start a car WITH NO BATTERY. Low and behold all are true. When changing out my battery I discharged it completely then charged it to 7% with my old battery which registered at 11.2 volts. I then moved the 7% device to my car and jump started it perfectly fine (with NO battery). So far im very happy with it and will likely get a second for my wife's car.

Failed after two uses. Not a good quality product. Wont purchase again

I had my doubts, but Project Farm said this was in a league of its own and so I gave it a shot. Tried on a small diesel compactor where I have tried to charge the battery with no luck, so I know it is very much almost completely a dead battery. It wouldn't even charge up this jump box. So I put the box on another charged battery and in about 2 minutes the box was fully charged. Put it on the compactor, pushed the button, waited for the count down and BAM! Started right up! The reviews I have read complaining about this product appear to be from people not using the product as instructed. This thing works unbelievably well. Truly in another league. I hope it lasts for years to come and hundreds, if not thousands, of jumps.

Very useful don’t have to worry about hot or cold damaging the booster works every time recommend