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

A quality Jump Starter is an essential requirement for all vehicles. The new Rexing 4000A Jump Starter has several of the features that I like most in a modern Jump Starter. The 88.8 WH size means you can use it to jump start your car and also to charge your phone and laptop when you are away from home. I was able to charge a full size laptop from dead to fully charged and still had a charge .Another great feature is the 12” cables. A lot of the Jump Starters use cables so short the Jump Starter has to be sitting on the battery to hook up and even then it is sometimes difficult to arrange it so it can be securely clipped to the battery so you can start the vehicle. The Rexing Jump Starter also includes a durable zip up protective case that has a separate zip up section that holds the cables and clamps to keep things organized. This is a great addition to the Rexing product line and holds a charge well while in the trunk in case it is needed. Also the one button operation is so easy anyone can use it but also includes the Boost feature for jumping large engines or using the Jump Starter when it is partially depleted. The Jump Starter also recharges quickly with an input of up to 65W and has a large bright display that shows the accurate percentage of charge and input or output power. It also has the ability to supply power via 2 USB A connectors and one USB C connector. The same USB C connector is also used for recharging the Jump Starter. The Jump Starter also includes a bright light that has flashing modes for safety at night.

The RJ4000 jump start pack is an excellent addition to my car travel kit. It has a solid build quality and the carry case is robust. I appreciate the light as bad things tend to happen at the worst possible time, so a light will make using this jump start pack easier. I like the USB ports to charge a phone or other devices. I fortunately haven't needed to use it yet, but it's convenient to have even if you drive an EV, as you can use this to help out someone else in need. For jumping ICE cars, using this will certainly be easier than trying to properly align two cars and messing around with long cables. I recommend this product for any car.

The Rexing RJ4000 Jump Starter provides the power you need to jump start your car when your car battery is not able to do so. I recently had to use it on my 1st Gen Honda Pilot with a 3.5L V6 engine and it had no issues at all. This allowed me to drive the car over to the auto parts store to purchase a new battery. This was such an easy solution than having to bust out my jumper cables and pull my other car over to use that to jump my Pilot. That is the main purpose of this device, but it can do so much more. Rexing says it can hold a charge for up to 2 years, so you can rest assured that it will be ready when you need it later on down the road. Some of the additional features this has is a very bright LED light that can flash and strobe as well. This light is powerful! Also, it has two USB Type A ports that can utilize the QC 3.0 (Quick Charge) standard for mobile devices. The USB Type C port can provide 65W of power to keep my Dell 15” laptop charged on the go as well. There is also a barrel plug for a DC output 12V power adapter for other devices. The large power display on the jumper will display the current battery level, power indicator, Warning information, BOOST indicator, DC Output indicator, and various USB information. A very sturdy carrying case is also included that easily fits all the accessories and protects the jumper from damage. I do with the jumper itself had some rubberized bumpers on it, it is all plastic, and although sturdy, it will get scratched up if you drop it or are not careful with it. It is also on the large size of things; it is about twice as big as the jumper that I had previously. With Registration, Rexing will give you an 18-month warranty, but a 12-month is standard if you don’t register. Speaking from experience, Rexing’s warranty department is great, and they are always very helpful. Overall, this large sized 4000A jumper can provide you with peace of mind that you won’t be stranded somewhere with a dead battery on your Car, laptop, phone or all of the above.

This is my first jump starter from Rexing. I have owned several of their dashcams and have been happy with those purchases. So, when I saw they launched a jump started with powerful battery, I jumped into it and I am glad I did. Some other unit I purchased before had issues retaining charge. But this one retained charge fully after 7 days. I tested it in my car after letting the battery drain and it started right away. The powerful battery ensures large cars can be started easily. The LED light is a big plus. A bit pricy compared to others in the market but overall it lives on to it's reputation.

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!