WOLFBOX 4000A Jump Starter 12V Car Battery Jumper Starter Portable with 65W Quick Charger LED Display 88 8Wh

Easy to charge, easy to use, and effective. Seems to be of good quality and comes with a nice case. Read more

This unit represents a good compromise, between pure ultra capacitor versions that have no internal battaries and larger size units that potentially have higher capacity ultra capacitors and larger lithium ion batteries. The former ones relay on the remaining capacity of the partly discharge battaries to charge the ultra capacitors which actually jump start engines while the latter ones use internal battaries. In my case the use is double fold: for jump starting in case of emergencies and for running electronics while biking. I tested both. The unit had no problems starting a V8 with battery partly discharged, and was capable of topping off a bike mounted camera along with an advanced Garmin computer for 3 plus hours while only consuming 10% of battery capacity. It was also neatly kept in a larger size frame mounted bag on the bike. Read more

I wish I had bought this a long time ago. What a great tool for starting a dead battery! Hassle free, no need for extension cords or dragging a weighty battery charger outside. This thing fits in your coat pocket, hooks up in seconds, push the start and start your truck or car up. All set to go in less than 3 minutes. Read more

Definitely better than my previous jump starter, I can actually leave it in my car without charging it or worrying about the heat damaging it, I haven’t charged it in a while so it does have good battery life. I helped someone that needed a jump once and a few others with my old starter, definitely handy, and a life saver in case you need it in the worst case scenario. Safer than your traditional passing cables and you can take it anywhere. Definitely recommend getting one cause I’m getting another one for my car soon Read more

Nice unit seems to work well, hold charge a decent amount of time, priced right , own two,charges fast when it needs to be recharged Read more

I’ve got an old Chevy. It’s actually a 1995 3/4 ton with a 5.7L motor. It’s no joke. My starter is going bad and so when I go to start it in the 0 degree weather that we have up here in AK, it sucks a lot of juice from my battery and usually I don’t have enough battery power and need a jump. I have been quite pleased with my 4000mhA WOLFBOX. It has started my old truck 5 times in one day and still had over 50% of the battery life left. Quite pleased. I have yet to figure out why it won’t start a side post 12v though. I brought it along when I went to help a friend. He needed a jump start. When we hooked it up to his side post 12v……nothing. I ended up having to get the old fashion jumper cables with my truck on that one. I tried to jump another side post in another vehicle and….nothing. Like the jump box wouldn’t recognize that I hooked it up. I don’t get it. I also tried to jump another newer vehicle and there was nothing until I pushed the boost button. I am still rating this WOLFBOX with 4/5 stars. It’s alright with two thumbs up!! Read more

MegaVolt24, 4000A. This thing works and was easy to use. The length of the jumper wires are pretty short, so depending on where the connections to the positive / negative terminals are under your hood, you may need extension jumper cables (proceed at own risk). Day 1: due to single digit Fahrenheit weather, the 12V battery of my 2020 Rav4 gas/hybrid (2.5L, V4 engine) dropped low enough to prevent the engine from starting and the dash from turning on. I wasn't able to use another car to jump it, so I ordered this portable charger. I figured $120 was way cheaper than AAA or a tow - plus I can use this again and again. Day 2: the battery was so dead I couldn't even unlock the car with the key fob. Not great. Day 3: this device arrived, pre-charged to 72% (the manual says >50% is needed for a jump) but using the included wall plug & USB-C cable, it charged it up to 100% within 30-45 minutes or so. I probed my car battery and it was dead dead, at 3V and change. I connected the MegaVolt24 to the terminals, it started beeping and indicated "Low Battery" on the display. Based on that, the manual told me I needed to hit the "boost" button on the charger for 2s, then start the car. And bingo, it got the engine going! I drove the car a little but had to jump it again after parking and the total charge of the MegaVolt24 went from 100% to 90% after two jumps. I'll likely need to replace the battery but this portable jump charger is super handy. Though I'd recommend against leaving it in the car throughout winters & summers as the internal Lithium Ion batteries should stay between -4F and 140F, but will hold their capacity longer if kept around room temperature. Read more

We recently had a major coldspell here. The temperature was -15 F, and the windchill was almost -40 F. I tried to start my V8 truck, but the starter only made the dreaded clicking sounds of a dead battery. I got out the WolfBox, hooked it up, and tried again. It started right up and used only 3% of the WolfBox’s battery. This is the first and only time I’ve ever had to use this product. But based on how it performed? I think it really must be powered by wolves or something. It also doubles as a power bank and can charge your phone if you need to make an emergency call and find your phone battery is out of juice. I highly recommend this product. It works extremely well, and it’s easy to stow in your vehicle in case of an emergency. If you live in an area with extreme winter weather, especially if it’s a rural area, this product is affordable enough that I’d suggest keeping one in each of your vehicles as part of your emergency kit. Read more