KeenPower

SAFETY BUILT IN. PROTECTION ON TOP.

Supercapacitors store energy physically—not through chemical reactions, making them inherently safer than traditional batteries. KeenPower adds 5-in-1 protection circuits for an extra layer of safety, with reliable performance even in extreme heat.

Two layers of protection. One worry-free jump starter.

LEAVE IT IN YOUR CAR. EVEN IN SUMMER.

No battery chemistry to worry about. KeenPower’s supercapacitor technology is built to withstand extreme heat, making it ideal for year-round storage in your vehicle.

Up to 158°F. Always ready when you need it.

MORE THAN SAFER, A DIFFERENT TECHNOLOGY

Traditional batteries rely on chemical reactions to store and release energy, bringing slower energy delivery, heat, and degradation over time. KeenPower supercapacitors work differently—storing energy electrostatically through physical charge adsorption for ultra-fast charge and discharge, with over 1,000,000 cycles.

BUILT FOR EXTREMES. READY FOR ANY WEATHER.

From freezing winters to scorching summer heat, KeenPower supercapacitor technology delivers reliable performance from -45°F to 158°F. Unlike traditional battery-powered jump starters, it’s built to handle extreme temperatures without the same battery-chemistry limitations.

Freeze it. Heat it. Keep it in your vehicle. It’s ready when you need it.

MASSIVE POWER THROUGH EXTREME COLD

Supercapacitor energy storage delivers reliable performance in extreme cold. Massive 6×3000F capacitors are able to provide multiple consecutive cranks for stubborn engines. Lithium electrolytes freeze, causing massive voltage sag and triggering BMS cold-lockout. Meanwhile, underpowered 500F mini-capacitors have anemic energy depth, draining their total charge in just 2 seconds on the very first failed winter attempt.

AUTOMATIC BATTERY DETECTION & CHARGING

Simply connect the clamps to your 12V battery. KeenPower automatically detects the battery voltage while charging the supercapacitors. The detected voltage is displayed on the screen, right inside the battery icon.

Testimonials

★★★★★
This thing rules. I have had a to. If different lithium ion ones in the past with varied results. But literally every one of my lithium ion jump starters are now trash.

This one uses no batteries. Once you get used to using this the thing never fails. I have a fleet of vehicles both gas a d diesel and its literally never failed me 1 time. The best thing is it's light and you don't ever have to plug it in! Highly recommend
Rockin
Reviewed in the United States on February 15, 2024 Verified Purchase

★★★★★
I've been having trouble with several of my cars maintaining the batteries. My 1998 Silverado was left at my summer home and the battery would get so low that it would set off the car alarm. I charged the KeenPower off the dead battery and jumped the truck which started Immediately. I ran the truck for a few minutes, shut it off and tried to restart it without any luck. I recharged the KeenPower off the dead battery in three minutes and started the truck again. The truck battery can't keep a charge so I'll have to replace it.

I also have a boat with twin crusader 200s that I haven't used since August on a mooring. Both starter batteries were dead and couldn't even run the bilge pumps. I turned over the first engine with the KeenPower but couldn't start it in the 25 seconds of discharge. I recharged it off the boat battery and started it on the second attempt. I recharged it again and started the second motor after two attempts.

I really don't care what the critics and nay Sayers think about the KeenPower. I've never had a piece of equipment do what this thing did to my truck and my boat. No one in the boat yard could believe I could start the engines without having the boat towed to the dock.
Dee Wight
Reviewed in the United States on October 12, 2023 Verified Purchase

★★★★★
I love this jump starter. First time I used it was on my 7.3 liter diesel truck. The truck was showing 10.7 volts and the engine barely once turned over. I took the jumper from the box and hooked it to the truck. It only took the booster about 3 minutes to charge to 100%. At first I didn’t realize that I needed to push the button on the booster so nothing happened. Once I pushed the button, I was able to start the engine. It spun the engine over like it had two brand new batteries in it. This is well worth it, especially since you never have to worry about keeping it charged.
G Shinn
Reviewed in the United States on January 14, 2024 Verified Purchase

★★★★★
This unit was a lifesaver, just this month I went out to leave for a dentist appointment and the car would not start. While I have jumper cables in the car, finding someone to assist is challenging. This unit easily connected to the positive and negative battery terminals in the car without having to struggle for a solid mechanical connection. The included instructions were straight forward and following them I pressed the power button and the display on the unit confirmed a full boost was in process. I hopped in the car and I started on the first try (it was wonderful to hear my 5.7L V8 running as it is supposed to). Recharging the unit was simple as well, using the included USB charging cable, it took a bout 4 hours for the recharge to complete.
David Harvey
Reviewed in the United States on December 27, 2023 Verified Purchase

★★★★★
Better than any jump box and I jump 20
Cars a day
Amazon Customer
Reviewed in the United States on February 2, 2024 Verified Purchase

★★★★★
So easy to use,saves time getting my big compresser going and pulling out the hose,now just unzip the case,connect the hose and pull the trigger,in a few minutes your done,great.
speed
Reviewed in the United States on April 1, 2024 Verified Purchase

★★★★★
This device gives me peace of mind! I have always carried device to inflate my tires but the had to plug into a lighter! Now I can depend on this device and not have to worry too much….at least I’ll be able to get to a pump or tire service center when I have a low tire. The thing I like is I will check the air in my tires more often….it’s so handy and simple to do with this pump!
Patti B
Reviewed in the United States on March 2, 2024 Verified Purchase

★★★★★
As we Amy all have experienced with items in a case carrier, once you remove the stuff, you seem to never have the room to replace the items as packed by the factory. So, when I unpack such an item, before removing the items, I snap a few pictures so I can replace the items to fit.
After taking iPhone photos I removed the items, and owners manual. Even though the replacing is not complicated, for this product, would you believe there is a Packaged Card in the case showing the steps to replace the items to fit? What a nice touch to the packaging.
Will update this initial review when I get to use it. Purchased it for my Auto, Utility Trailer, Bicycle, John Deere E170 tires.
Den
Reviewed in the United States on February 12, 2024 Verified Purchase

★★★★★
A different kind of boost pack than the lithium ones, and with added benefits. One is that it's not affected by temperature so much, and isn't at risk of material+electrolyte fires like lithium batteries can be. The other benefit is the extremely high currents it can output. A great tool to have at your disposal during those real cold days.
Dwayne
Reviewed in the United States on February 26, 2024 Verified Purchase