J400 2000A Portable Jump Starter, 12V Lithium Battery Booster with ConnectMax Tech, Smart Digital Display, Car Jumper Box for Up to 8.0L Gas & 6.0L Diesel Engines

This lightweight, compact and portable jumpstarter is just what I needed. Will be using to jumpstart an old humvee. It also has features for flashlight with two additional hazard flashing white. This will be stored under the seat. Good for USB C charging too. Well-made and intuitive. Great for taking off road since it holds battery long time.

Bought this over the NOCO after seeing reviews and videos. I have a Viking jump pack at 1000a and it is more expensive than this unit. I have used the 1000a to jump all of our vehicles when needed, including my motorcycle and my lawn mower, so this unit shouldn't have any issues with anything I throw at it. Lightweight, compact and easily stores in your vehicle. Bought this to keep in my truck. I like being able to jump start the vehicle without needing another vehicle to use jumper cables. Keeps you self-sufficient and gets you out of a jam if you find yourself alone in a remote area. Charges quickly and doesn't lose charge over time like other traditional jump packs. Like other lithium jump packs, they do recommend that you charge the unit every three months to extend the life of the batteries in the unit. Pretty standard.

This Lokithor J400 jump starter has already paid for itself because it saved me from being stranded by a dead battery. It is easy to use and easily starts my mid-size car battery. I can actually use it several times before it needs recharging. At least 4 or 5 times. Easy to apply and easy to charge with a USB charger. The flashlight also comes in handy in an emergency. It is also capable of charging a cell phone in an emergency. The cell phone charge rate is kind of slow compared to a standard ac charger but it does charge a cell phone. It was well worth the sale price that I got it at. I have already needed to use it for a jump start 4 or 5 times and it comes in handy especially when you are stranded.

Unit looks like it can perform well. The battery clamps are very large which will make them easier to clamp on my truck posts. My only con is that it doesn't come with a storage case...:(

This lil guy is AMAZING!! I had a bad battery, and this started my car up right away! It was so easy to use. It kept my car alive each time until I was able to buy a new battery over the weekend! I will not go anywhere without it now. It lives in my car. I also want to note, I fully charged this device as soon as I bought it in November, used it a hanful of times. It has been in my car ever since. It is now, almost February, and I decided to see if it would power on, and it DID! Not only that, but it is has about 98% charge!

The LOKITHOR J400 Portable Jump Starter is an excellent tool to have. I really like that it includes both USB-C and USB-A ports, which makes it super convenient for charging different devices. The built-in flashlight is also a great bonus, especially for emergencies or nighttime use. Compact, powerful, and practical — totally worth it!

UPDATED: Worked great to jumpstart my old jeep. We had our first hard freeze of the year and my battery was dead. Jumpstarted flawlessly. I have owned a battery jump starter for several years for our primary vehicle. I bought this particular one to keep in our secondary vehicle. It is compact, but heavy, which, i believe reflects its battery capacity. I havent had the opportunity to jump start any batteries with this Jump Starter yet, so i cant review that aspect, but I like the display - large and bright. I also like the large and extremely bright flashlight, which would be useful in any night-time emergency situation. I also like that there is a usb charging port. This would be particularly useful for charging a dead phone in a crunch. I am glad to know that this will be available when I need it.

I bought the Lokithor J400 because I was impressed by how much capability this compact unit offers. The rated 2,000 amps peak for jump-starting vehicles is boldly stated by the manufacturer, and other reviewers have seen that it works reliably in real-world tests for typical cars. The unit also doubles as a portable power bank (charges with USB-C and provides USB-A output) and features a 300-lumen LED light with SOS and strobe modes, which means it’s useful beyond just jump-starting a dead battery. The build feels solid, the clamps and cables are heavy-duty, and the added safety protections (reverse-polarity, spark-proof, over-charge etc.) give extra peace of mind for roadside use. If I were to offer constructive feedback, the J400 may not match the larger multi-function beasts that include built-in air compressors or additional tire inflators, so if you’re expecting all-in-one “trailer/RV” emergency gear you might want a more feature-rich model. Additionally, while the size is compact and convenient, that means you still need to keep it charged if you intend to rely on it during long-term storage. All in all, if you’re looking for a high-power, relatively compact jump starter with power bank for typical car use, the J400 hits that mark quite nicely.

Super