Rexing - 4000A Jump Starter, 12V Car Battery Booster with 65W Quick Charger

I recently purchased the Rexing 4000A Jump Starter and so far I’m very impressed with it. The unit feels solid and well made, not cheap or flimsy like some of the other jump starters I’ve seen. The LCD display is easy to read. One of the things I really like is that it’s more than just a jump starter. The 65W fast charging feature is great for charging phones, tablets, and even laptops while traveling. The built-in flashlight is also a nice bonus for emergencies or nighttime use. Heres what I think stands out about this charger most, is the fact that I can remove the jumper cables and store the unit in the case, if you’ve owned other car jumpers, then you know that the cables cant be removed. I tested it on my Jeep that had a dead battery and it started the car quickly without any issues. It gives peace of mind knowing I have this in the vehicle in case of an emergency, especially during winter or long trips. The carrying case keeps everything organized and compact, and the battery seems to hold a charge well. Overall, this is a very useful and reliable product that every driver should consider keeping in their vehicle. This is the BEST Jump Starter that I own. Thank You Rexing for putting out such a great product!

I bought this jump starter to keep in my car in case of emergencies, and I'm really glad I did. I drive an older model car and have had my battery die more often than I'd like, so having a portable car jumper is a must. I do pay for roadside assistance, but sometimes the tow service can take up to an hour or more, so it's nice to have the option to handle it myself. Out of the box it arrived charged to 81%, so I was able to test it right away without waiting around for a full charge. Build quality feels solid and durable. It's noticeably heavier than I expected for something this compact. The display is a nice and easy to read the battery level and status. The 65W USB-C charging is a great bonus feature. It charges up fast, and I've used it to top off my phone a couple of times when I was out and about. Having a USB-C in/out port plus the USB-A QC3.0 port means it doubles as a backup power bank, which makes it feel like less of a one-trick item sitting in my trunk. I was recently at a convention and someone nearby needed a jump. I was excited to try it out for the first time, so I offered to help and hooked up the cables, pressed the boost button, and their car started right up within minutes. It was so much easier than I expected, and it felt great to actually help someone out on the spot. It does mention that it supports vehicles up to 10L gas/diesel engines, trucks, boats. I only have a car so I can't personally speak to those use cases, but it's reassuring to know it has that kind of headroom. The multi-mode LED light (steady, strobe, SOS) is a nice added safety feature for nighttime emergencies too. Having this device in my car makes me feel a lot more confident and at ease. Highly recommend keeping one of these on hand.

I purchased this Rexing Jump Starter to boost my Kubota construction equipment and my Ford F250 diesel which has a battery drain problem. Rexing has three different models: the 2000, 3000, and 4000 amp versions. I went with the largest one because the diesel engines have high battery drain from the starter motors. The package arrived from Best Buy 2 days ahead of the expected delivery date which was great. Inside the box are the booster unit, a set of jumper cables, a USB C charger cable, and a USB A charger cable. There are two USB A plugs and one USB C plug on the unit for connecting your devices which is handy. The USB C plug also doubles as the charging port. My unit arrived with 73% charge on it and in less than an hour it charged to 93% charge with a 20 watt USB C charger block. The light is very bright and activates by holding down the power button and quick presses of the power button turns the light from steady to SOS and flash modes. This feature is very nice if you are stranded on the road at night. The display is awesome showing percent charge remaining, output watts, boost mode when activated for the jumper cables, and which ports are sending or receiving power. The unit itself and all the cables fit very nice in a zippered case which can be easily stored in the trunk of your car. The real test of a jump start booster is how well does it boost. As mentioned before I own several types of diesel equipment that are not frequently used. My Kubota excavator is five years old with the original group 24 battery. After a long winter of no-use, the battery would not crank the engine. I connected the Rexing Jump Start and it cranked right up! I took a photo of the booster connected to my excavator but could not upload the video which really shows it in action. I am sold on this product which is much easier to connect than driving my truck up to side of the equipment to boost it with jumper cables or trying to run a battery charger overnight while it charges. There is no electricity at my pole barn so trying to connect a battery charger would require me to get a portable generator to connect the charger to. This portable booster is way more convenient! My truck battery is holding a charge (for now) so I could not test the Jump Start on it, but I suspect it will work as well as it did with the Kubota equipment. Although this booster would be good as a backup USB charging battery and an emergency light, it really shines as a battery booster for your auto, lawn mower, or heavy equipment. As already mentioned, the booster worked great getting my Kubota excavator cranked with a dead battery. I highly recommend everyone keep one handy should you experience a dead battery.

Excellent quality jump starter. Very easy set up, easy to use and very versatile. Two cords come with the unit, USB-C to USB-C and USB-C to USB. The unit itself had one USB-C plug and two USB plug in’s. The flashlight alone is worth the purchase. The jumper comes with a very nice soft side case to contain the unit, jumpers and the cords. The size is larger than some of the other small options but much smaller than the old jumper boxes. This jumper does the job intended without question. This Rexing jumper lives up to the quality you would expect from a Rexing product.

This Rexing 4000a portable jump starter and battery is a great item to have around in case of emergency or if you'e going to camp where finding an outlet might be an issue. It would also be useful if the power goes out at home and you need to keep your devices topped off. The best use of this is if you're stuck with a dead battery or if you see someone on the side of the road that might need assistance. I used this to jump my friend's battery and it worked like a charm. It didn't hesitate at all. The flashlight also came in handy because trying to jump a car in pitch black is no fun. It comes in a nice case so you can keep all the cables and the jumper in one convenient place. I would say the biggest drawback is its portability as it's a hefty fella. However it has a lot of juice so you can jump or charge more times between having to recharge the unit. If you have an older car or not sure if your battery is going to go at any time this will give you piece of mind.