WOLFBOX 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, MV24

Very happy with product. Charged quickly. Easy to use and start vehicle.

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!

Excellent! Very powerful and more convenient than using the standard "jumper cables!" Used a few times already to start a riding mower, and even a motorcycle once, and it worked perfectly!

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 bought this to replace my very heavy jumper box. It holds a charge, has a light and USB ports. Worked so well, I bought one for all the kids' cars!

[Update: I have added 1 star, raising the rating from 3 to 4, because almost immediately after this posted, the company reached out and refunded my purchase, proactively, without even hearing back from me. That is five-star+ customer service as no onr has ever done that for me. That said, the product still needs an adaptor with a spaded prong, a smaller clamp uption to fit tight terminal spaces in cars like a Checy Sonic, and a quick start guide. But great customer service and a product that worls well if you get past the learning curve and/or improvements needed is worth a 4th star. The rest of this review is unedited (the original 3 star review). Also, with that refunf, I should probably qualify this edit is now as a 'compensated' review, though it was a surprise that came after the original purchase and review and did not influence me except by showing some respect for my experience and comments. That differentiates this company from most.] I had a portable jump starter on my wish list as a 'prepper' for quite awhile. Given the countless times I have needed and used a portable air compressor to air up low or flat tires (for myself and others), I knew it was only matter of time before I'd wish I had more than cables in the car. Sure enough, had to cancel a date recently when I went to the garage to head out and my car was completely dead, no lights or dash or dings/alerts. Ugh. Car was facing into the garage, so a jump from a neighbor's car was not really likely, but my daughter's Cadillac was parked next to mine. I had the keys since she was out of town, but guess what? It was dead, too (had lights and dash, but the ampmeter showed it under 9 amps and it would not turnover, because she's been gone long enough and I'd failed to start it/run it). After calling some neighbors to see if they had a portable jumper or even a trickle charger (nope), I logged into the jungle here to see if my Wirecutter recommendation, the one I'd delayed buying because it was rarely on sale, costly, and did not seem to be fulfilled by either Amazon or the manufacturer (even though it references a Weego store onsite), was on sale etc. Nope. So I started searching the listings and found the Wolfbox 4000 on a good sale, read a LOT of reviews and watched videos, enough that even allowing for some possible 'astro-turfing', I liked what I saw and read from those who liked it more than what I read from those who did not. By the time I ordered it, it was 2 AM, but the cart still said it would be here by morning. When I awoke at 8 AM, it was on my doorstep. Opened it and went to charge it right away, planning to jump the car at lunch. This was where I ran into my first 'snag'... though well packaged and presented, it lacked a 'quick-start' guide, and the manual did NOT explain how to turn it on. Huh? OK, you'd think that is easy, it has a power button and a 'boost' button, that's it. I pressed each, and both, and nothing happenned. So, I thought, crap, is it DOA? Found nothing in the manual I'd overlooked. So, figured it must need a charge to come on. Made sure I had a live outlet (not tripped) in the kitchen and plugged it in to charge. Still no lights or power, so, frustrated, I walked away thinking maybe it needs awhile. Came back two hours later, pressed the power button, nada. So, now I'm ticked. I log back in here thinking, if I cant find a review or video that tells me what I missed, I'm going to have to return it. I started watching demos again and nothing jumps out, until I come across one grainy, shaky quick vid with no audio at all, and I notice the guy does what I did: he presses the button, and nothing happens, but THEN, he presses the button and HOLDS IT DOWN FOR 2 SECONDS: it powers up! OMG. How hard would it have been for Wolfbox to indicate on a quickstart piece of paper that you have to HOLD THE BUTTON DOWN FOR 2 SECONDS to turn it on? I try it, and it comes on at 78% charged. Now, I suspect it may have arrived with that charge, because now that I have watched it charge to 100%, I think it would have fully charged in the time I had it plugged in if it could charge while powered off. Snag #1 solved, after a delay of several hours required to figure this out on my own when I should not have had to. Snag #2: I also blame this on lack of a quick-start slip. My kitchen has outlets with ground fault breakers that do NOT have red/green indicators, and they trip a lot, but I cant tell unless something doesn't work when I plug it in. I had moved this unit out of the kitchen when trying to figure out the power up mystery, so when I plugged it back in to charge, was a bit surprised there was no 'charging' indicator that was obvious. Nothing changed on the display. I walked away and like 30 minutes later checked, still at 78%. Hmm. Reset the breaker, checked again, still no change, waited, no increase. Ugh. But when trying some different outlets again, the way the 65W charger is put together reminded me of a USB charger I got cheap once, which clearly was not made in the USA. It also had the 'swivel prongs' this had and the prongs were straight (no bigger 'spaded' prong for the one side like most US made prongs, which effectively 'snaps' the plug into your outlet when you get it pushed in and keeps it from falling out). So, I first make sure the prongs are fully swiveled out (there is a bit of play possible and figured maybe that can break the circuit). I watched when I inserted it what I think of as 'normally' (with the bulf of the adaptere hanging below the prongs, prongs at the top). As with my other cheap charger, I could see that the weight of the adapter was causing it to come away from the outlet slightly. This happens with bulky adapters that have no wide spaded prong to snap them in and hold them. I had to turn the adapter upside down, with prongs at the bottom, so the weight of the adapter above the prongs pushed them INTO the outlet insted of pulling them AWAY from it when hanging below, and push to make sure it was firmly in place to begin with. THIS completed the circuit, and immediately I saw the green 'IN' light and a 'fast charging' indicator both come on. Within minutes, the percentage rose from 78 to 79, and it was fully charged not too long after. SNAG 2 solved, after another unnecessary delay. Snags 1 & 2 were 'sunk costs' for me, I paid the price of a learning curve I should not have had to, but lessons learned, those issues were now avoidable going forward. The product loses 1 star from me for that and the associated bad initial customer experience and bad first impressions. Put a quick start guide in (with bigger print than the 4 font in your instruction manual) guys that covers these issues. And/or make an adapter with a spaded prong to hold itself firmly into the wall to complete the circuit. Snag 3: Now I am ready to try to jump the completely dead car. Having watched some videos from people who actually used the product and jumped fully dead batteries, I knew the 'boost' would likely be needed to bypass the units limiters and let a full charge into my battery. But first I needed to get it hooked up. I had noticed that the jumper cables connector was a VERY tight fit (as other reviewers have noted), so even though it seemed like it would not fit, I persisted carefully and got it in. This was not the snag, but I mention it, as later, when I took it out, it was also VERY difficult to get unconnected, bad enough that I believe the connection could sustain damage over time unless a light lubricant is used (I have not tried that yet, but am debating what the best alternative there may be). So, I do consder that a slight engineering flaw, but, better too tight than too loose (like with the wall adapter). So I go to clip my battery posts. The cables ARE very short, as complained about by some other reviewers, but if you want compact portability, that just has to be like that, from my perspective, so I didn't mind it. But my 2013 Chevy Sonic LTZ's battery has a design where the posts are recessed to be level with the battery caps next to them. As a result, the car's cables can't even use those fat terminals, they have to use the thin clamping circles to even have room to connect. These big fat alligator clamps in the Wolfbox just did NOT want to fit on my posts in the small amount of space allowed. Now I knew there had to be some angle, some way, so I did not give up, but, especially on the post closest to the front window, which had the least room of the two, it took over a dozen tries to find a 'spot' and an angle that I could get the connector fastened where it would grip and not pop itself off. In that effort, the clamps sort of wore out my old, weak hands (I'm 59 with diabetic neuropathy, shaky hands with little strength or feeling in them). I was not pleased. Nor was I sure that the tenuous grip I had found would hold for long or as the car was trying to turn over. But once I got the second clamp to also 'grab' finally, the indicators clearly showed I had a connection. No lights inside my car came on (I had the door open) and no door ajar alarm, so I knew it would not start without the boost. So, I pressed the boost button. Of course, nothing happened until I tried a second time and HELD IT DOWN (figured by that time, but just testing) which after pressing it a couple seconds, the circuit was made, my interior lights came on and the door ajar alarm was dinging. Got in, boom, it turned right over and started. SNAG #3 resolved, but I am taking a star off for the clamps being too large to get onto the posts of my car battery reliably/easily and too hard to squeeze to get them open. I noticed with the Weego trickle charger, that came with three different connection options: 1 smaller/narrower clamps (which would have obviously opened a lot easier and fit), terminal connectors, and a third option that I am not even sure what it was. In retrospect, that is both very smart and also probably a reason their products cost a bit more; a trade-off is they do not have a carrying case at all (Wolfpack has to fit their accesories in their case). Maybe Wolfpack could make different ordering options where the clamp sizes/types vary and/or a package with all the options (for people using who want to be able to service all types of batteries). I did have to jump the same car two more times before I got the battery back to full life by driving it (I had drained it by leaving some parking lights on, I believe), and my daughters Caddy. and it got the jobs done. Using boost drained it about 8 % each time for my Sonic. It only dropped a couple ticks starting the Northstar 8 cyclinder in the Caddy (and boost was not needed). I did not have to recharge the unit between any of those three jumps. The case is really nice and I am glad to have it in the car. Had my user experience been smoothed by a proper quick-start guide they'd likely have gotten 4 stars from me. The two engineering flaws (the unspaded adapter prong and the alligator clips excessive width and excesssive strength) need overcome for the fifth. But if you are willing to buy it knowingly, I do think this is a good enough unit, especially for the price, to recommend it. The only part I can't review is reliability over a long time. If I have any new issues with it over time, I will edit the review accordingly. One of the next reviewers to come along would serve their viewers well to point out the lessons here, too. Final evaluation, three stars for average overall. Now that I know I will need a trickle charger for when my daughter's car will sit for so long, I'll likely give the WeeGo a try after this experience with a lack of connector variety.

Top of the shelf quality. When you need to use this product, you really need it. 100% reliable.

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.

Totalmente efectivo y práctico.

Top

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.

Que funciona de maravilla y puedes arrancar un vehículo sin batería varias veces sin problema