4000A Jump Starter,12V Car Battery Jumper Starter Portable with 65W Quick Charger,LED Display,88.8Wh Booster Jump Box Pack (10L Gas 10L Diesel Engine) with LED Light,Jumper Cables

WOLFBOX 4000A is absolutely the best jump starter you can buy for the price you will pay. It is solid, dependable, and holds a charge for months. There are many good jump starters on the market today and competition for sales is heating up. However, if you want to charge your jump starter, put it in your vehicle and be confident that it will work properly in an emergency situation, buy a WOLFBOX. You will initially spend a few dollars more, but the confidence in the product and "peace of mind" is worth it. I own two WOLFBOX jump starters; the 4000A and the 4000A with air compressor. WOLFBOX Customer serve is the best, by far. They stand firmly behind their products and are genuinely concerned about product quality and customer satisfaction! Between Amazon's and WOLFBOX'S excellent Customer Service, you will never regret your purchase!

I have a 2004 Saturn Ion that I don't drive often and have a continuous issue with the battery draining just enough that it won't turn over the engine. Been using a 4 amp Battery Tender, but was looking for something more convenient. I first bought another brand of jump starter, but it couldn't start a little 2.4L engine. Gave Wolfbox a go and glad I did. I had charged the jump starter over the previous weekend, so it was ready to be tested. Charges quick, has some weight to it and doesn't feel cheap. Went out this morning, car didn't start. Followed the directions, got in, turned the key in the ignition, and the engine turned over and fired right up! Awesome tool! And it only used 2 percent of the charge. UPDATE June 1st, 2026: Used the jumper eight times so far. The most impressive instance was after the car sat for five weeks during the really cold weather and two snow/sleet events we had in the Northeast this past winter. When things moderated and I finished clearing the remnants of ice out of the driveway, I connected my Battery Tender to see if I could put a good charge on the battery, but the light flashed and it would not charge because the battery was below two percent. Technically dead. I went back in and got the Wolfbox, connected it and the car started up first attempt. Took a few turns of the engine and three or four seconds, but it started. I was amazed. And it still has an 86 percent charge, ready for more jumps. Best tool I ever bought for my car.

I'm a senior citizen, went out yo start my car- dead battery. Had this overnighted, charged for 30 min, read the extremely easy to follow instructions, hooked it up in seconds, and started right up! Well worth it! There's even a BOOST button for a REALLY dead battery! Living in tornado alley, love you can quickly charge your phone, tablet, etc on it too! Highly recommend!

Unequivocally, my rating is FIVE STARS! I consider the Wolfbox a perfect product for its purpose! I am 80 years and 8 days of age and I had gone outside to run some errands and discovered that the battery in my 2005 Cadillac was totally dead - no interior lights or sounds. That evening I got online to Amazon and spent time studying all of the lithium battery powered mobile jump starters listed there. I finally made my decision to purchase the Wolfbox. No help or advice from anyone in the middle of the night. I first made sure that I had "Free Return" just in case that my choice might turn out to be a bad one. Then I placed my order at midnight. Prime delivered the Wolfbox the next day after lunch. I checked the items in the box, read the instruction booklet and proceeded to charge the Wolfbox up to 100%. Then I went outside, opened the hood of my car and attached the Wolfbox to the car according to the Cadillac operating manual. I followed the easily understood directions from Wolfbox and I got my car's motor started in about ten minutes while standing under the blazing Texas Sunshine in over 100 degrees heat. I disconnected the Wolfbox, hopped in my car and drove away to run my errands with all electrical equipment functioning and the air conditioning cooling me. Wolfbox is so great that I want to star in a TV commercial for the Super Bowl for maximum global coverage that should go viral for Wolfbox's contribution to the empowerment of Women's independence - even in their most senior years! I have always said that Triple AAA is is really Great and is a single girl's Best Friend - but you do have to wait around on their schedule! But with Wolfbox, my new BFF, I had an instant jump that kept me on my schedule with No Muss, No Fuss and No Bother! I am so satisfied with Wolfbox that I will be posting my experience on my Facebook Page! Thank you Wolfbox for a wonderful product that is so well protected in its own case and sold at an affordable price. Wolfbox did for sure design a very useful product that checked all of my boxes for purchase. I am a disabled senior citizen female who is now a Very Happy Camper! Thank you Wolfbox! Thank you Amazon! I wish I had had someone to video me jump starting my car but you will just have to take my word for it!

Arrived in good shape and on time. Although I haven't had to use it yet, it charged properly out of the box and the light works. The unit arrived with a 78% charge. I bought it primarily for use on my boat. The old jump starter I had (another brand) for the boat long ago gave up the ship. The technology and capability in the Wolfbox is MUCH improved over my old starter.

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!!

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.

I absolutely love this jump starter. I’ve actually purchased it twice, and it has not disappointed. It’s powerful enough to start my car quickly with no hassle, even when the battery was completely dead. One of my favorite things is how compact and easy it is to keep in my vehicle—it doesn’t take up much space at all. The built-in display is clear, and I like being able to see exactly how much charge it has left. The added bonus of the fast charging feature is super convenient too.It gives me peace of mind knowing I don’t have to rely on someone else or wait for roadside assistance if my battery dies. Definitely a must-have to keep in your car. Highly recommend!

Good starter at the price point . Give’s peace of mind knowing even with a dead flat you can start your car.

Totalmente efectivo y práctico.

Arrivé bien emballé a 76% tout fonctionne .robuste et fiable arrivé avec boîtier de charge français. je recommande a avoir dans son coffre

Great, until now. Didn't have the chance to try yet. Small size, powerful, and charges fast

Zeer positieve ervaring met de verkoper. Kort na mijn aankoop bleek dat de Wolfbox 4000A jump starter was afgeprijsd. Na contact met de klantenservice is het prijsverschil netjes en snel terugbetaald, zonder discussie. De communicatie was duidelijk en professioneel. Dat noem ik correcte en betrouwbare service. Het product zelf maakt een degelijke en robuuste indruk en voelt kwalitatief aan. Ik heb de jump starter nog niet daadwerkelijk op een auto hoeven testen, maar op basis van de afwerking, specificaties en de vele positieve YouTube-reviews van andere gebruikers heb ik er alle vertrouwen in dat het apparaat doet wat het belooft. Alles bij elkaar ben ik zeer tevreden over de afhandeling, de service en de manier waarop met mijn verzoek is omgegaan. Dat geeft vertrouwen en maakt dat ik deze verkoper zonder twijfel kan aanbevelen.