4000A Car Jump Starter, 12V Battery Jumper Starter Portable Jump Box(10.0L Gas/8.0L Diesel), Jump Start Battery Pack with 3 Modes Flashlight, Power Bank with USB Quick Charge & Type C Port

I already used it about 10 times! I live near Milwaukee so January and February can be brutal on car batteries (especially Walmart batteries)! I have multiple vehicles so sometimes my cars sit for over 5 days. Ok I was skeptical on buying this because the price was less than half of the popular ones. But I read a few reviews and took a chance. When battery was dead I hooked it up and instant ⚡️POWER ⚡️! Even when my dad's Lexus wouldn't start with traditional jump box, this thing did the job. (His car has electrical issues.) It's easy to charge, just use basic USB-C cable. I recommend using ur own USB cable because the included one is not Great. Even after several jumps the charge is almost full. I used to charge it after each use. Now I'm waiting to see how long it takes to drain the charge. You don't need the expensive units. This will do everything u need it to do. The carry case is great.

Within a couple of days of receiving this, someone at my bar had a dead battery. It was a large pickup truck. Started it within 2 seconds. Much more convenient than pulling a vehicle around to hook up jumper cables. Will buy more. Cannot beat the deal at less then $30. Update: Needed to use it 5 times so far. Starts everything within a couple seconds. Today I had to use it on a large diesel truck. The owner said it will never start it. Couple seconds and it fired right up. Few days ago, the battery on my large 6-cylinder diesel generator was dead. Again, fired up in second. 5 starts with it and still shows full charge on the indicator. I've already purchased another one for my dad. He has a farm, and something always has a dead battery lol

Used it several times. It keeps on working Good!

So it works great but I don't like how it blinks red and green as soon as I hook the cables into the box. Like why does it do that?? One time it took 3 to 4 cranks on a 06 Titan with a 3 year old battery in it and the battery in the jumper was dead and needed to be charged again, but while being stowed away it holds it's charge...I definitely believe it has 4000 amps but don't expect a bunch of tries out of it. Usually that means your battery needs replacement anyways and when you hook the cables to it get ready for a Christmas light show lol...oh and the built in light on it sucks and should be on the other side of the box. It points away from the battery....why?? Overall it does the job, big or small and the case is very nice and durable

this thing has saved me several times in COLD COLD COLD weather - I keep it charged and in my car during the winter - follow instructions on how to use, just a little technical, but easy to use when you get familiar with it

Seems to work good, haven't really had to use it though. I did try it on my truck but didn't work because the battery was too dead. This jumper won't jump a completely dead battery which I don't think any of them will now days for safety.

Claims to have a 24 month warranty but no way to contact seller to make a claim. Unit will not charge after 3 uses.

have used it a couple times and so far so good. havent done a massive v8 or anything just v6 and 4cyl engines. but jumped a basically fully dead battery with ease. i also take this with me camping and 4wheeling incase a phone needs power or another person needs a jump