GOOLOO GT4000S Jump Starter 4000A Car Jumper Starter (Up to 10L Diesel 12L Gas Engines), 100W Fast-Charging Lithium Jump Box, SuperSafe Portable Car Battery Charger Power Bank for 12V Vehicles, Yellow

Alright, so update on my previous review: This is an essential for me, especially for camping. I've had to jump my car (2014 town and country) about a dozen times since purchasing this due to a battery fault. This thing is the definition of overkill. Each jump takes somewhere between 10 and 15% of the battery life, and each jump, the van acts like it has a brand new battery, which is perfect. Biggest thing i've jumped so far is a GMC Yukon, which had zero issues.Outside of jumping cars, this is the champion of camping power. Its capable of charging all your mobile devices, rechargeable camping gear, even a laptop, without being the size of a lunchbox, and can recharge anywhere your phone can. Not to mention it can use any accessory your car's cigarette lighter can, and has a light. The only downside is this doesn't have any AC power, but that was never the point. Given the choice between this and a 150w inverter or a jackery (with a built-in inverter) and a car jumper, I'm probably going to pick this every time.What i've noticed since purchasing this:+ Perfect for camping: This can charge a phone, tablet, battery fan/light, other power packs, even a USB-C charge capable laptop without a hassle.+ Charges on a USB-C phone charger. 16w USB-C won't charge your laptop, but it will charge this, which charges your laptop.+ Jumps stuff others won't touch: When "smarter" jumpers detect a bad battery and refuse to jump, this will jump your car, without hassle.+/- Light is designed for local light or signaling, not as a flashlight. Great for keeping people from running into you, not so ideal if you need to see someone at a distance.+/- This will fast-charge phones, but is not compatible with 45w super fast charge 2 some phones are capable of.- Clamps are chunky. Not a big deal, but these do get in the way on certain vehicles where the battery is in an awkward spot.TL;DR at the top: Huge battery, extremely flexible power options (is currently charging the laptop i'm writing this on), easily starts average cars and acts as a massive power bank for whatever you want to do. Just a little bulky but well worth it!Detailed review:About two years ago, i received a NOCO GB40. Supposedly rated to 1000 amps, it time and time again failed to start the 3.6l V6 engine in my Town and Country, my roommate's Buick Rendezvous, really anything I ran across that needed a jump. After two separate incidents in a week where the GB40 failed to start cars under ideal circumstances (full charge, warm engines, no mechanical faults), it was retired, and the GT4000 put in its place.Out of the box, the GT4000 is chunky, at 9x4x2.25", its larger than your average brick. Throw in the accessory kit (jumper leads, USB-C to C and USB C to A cables, PD100 charge cable and a cigarette lighter adapter) and you'll have a fun time getting this into your glovebox. But then again, the GT4000 can probably jump much larger things than your SUV. The packaging is superb, and nothing in the box was really susceptible to shaking in the first place, but I'm fairly confident the box would have kept everything secure regardless.The User Interface is simple, there's 2 buttons, power and boost. Power turns on the device, and when held, turns on a surprisingly bright flash...light? The very bright LED strip is obscured by a milky plastic cover, so it works well as a flood light, but not so much as a long throw flashlight. You can change the mode or turn off by clicking the power button repeatedly. Once on, connect your power leads to the port on the side of the charger, plug in your battery, and click "boost" if the backlit LCD screen doesn't say "Ready". The included leads are plenty long for the majority of batteries out there. I didn't feel like waiting to drain my battery to test this, so I disconnected the battery from my Town and Country and started the 3.6l V6 directly off this. No shock, but there was no hesitation, no difference from using the standard battery, successful start. Obviously this is a bit like using a sledgehammer to hit a nail, but it works!Outside of its duties as a car jumper, the GT4000 has a plethora of charging ports. First is a USB-C, which can deliver PD100 power to charge a USB-C PD compatible laptop, or 18w fast charge for your phone. This is also how you charge your GT4000. Next to this are two USB-A ports, one feeds 5,9,or 12 volts like Samsung's rapid chargers, the other feeds 2.4a at 12v. There is also a port for a cigarette lighter port, so you can run a compact compressor or an inverter. Thanks to its 99.2wh rating, this can easily double as a power pack for camping or long-haul flights on budget carriers, as it will charge most USB-C chargeable laptops once, or run your phone for days at a time. And since it is under 100w, this pack does not have any specific regulations with the TSA outside of needing to be carried in a carry-on bag. (note, you may wish to leave the jumper cables at home if you take this on an airplane, no clue how the TSA will react. I'm not responsible for any TSA-confiscated items or enhanced screening protocols).The LCD display is extremely easy to read, and gives you a lot of data regarding your charger, including charge percent, status, charging rate (in watts, which is very useful for testing the power output of USB ports), and more. If you manage to sufficiently discharge the battery (below 20%), the display will flash, making it very clear to recharge. It sounds like this unit has an internal warmer to keep its battery at an optimal temperature for discharge, i've yet to need to use it, and will update the review once a need arises. I also cannot speak to the longevity of the device, as I haven't had time to cycle it hundreds of times, but I'll update this review as that becomes relevant.Overall, this well exceeds the needs I have for the battery, acting as a car jumper, laptop and phone charger, and USB tester. If you're looking for something you know will start your car whenever and wherever you manage to find yourself, this is it. The only negative is the size, but if you can find a spot in your car to put a couple bricks that you don't need to think about, then it shouldn't be a concern, and is well worth the extra space for the added capabilities over similar, smaller products.P.S. the jumper plug for this are the same as the Noco GP40, but reversed, so you can't use the leads interchangeably.

This is a very handy and powerful jumpstarter. Ive had several of the old school bulky ones that were aggravating and didnt last long. I had the walmart brand that never worked good for me. But this once has started everything and i have lots of toys and equipment. Its a must have when im on the water ir on the road. Ive started diesels with NO BATTERIES! (not recommended, im just saying) if the battery on my gooseneck winch dies i use this to finish tough jobs. Had an issue that was completely my fault and let me say their customer service is outstanding. They pick uo the phone but most is done by email after that but their response is consistent and super fast considering its a pretty big business. Fiona helped me and converted me from a person that likes their products to someone who will support their business.

Super good tool to have around!!! This jump pack was a big upgrade from my NOCO Genius Booster GB40 1000A that I had for 8 years now. I do small engine repair and have used that one for likely over 250 jumps, and I realize that this one is a 4000A instead of a 1000A, but then with how much cheaper it was than the NOCO brand, I was expecting more like a 2000-2500 maybe 3000A max in real life. Well, I didn't test the Amps output but it started a 5.4L gas engine with a totally dead battery quicker than the vehicle started with the new battery installed. Had to wonder if it's putting out more like 15v with those amps because it was already running with less than 1 second of cranking the engine, and it had been sitting for 6 months! Also, it only took 2% of the battery charge in the jump pack to start the engine. Anyway, I would highly recommend these jumps packs!

This is a pretty wild device.I've used tiny portable jump starters before, but they were always based upon lead-acid (car battery) designs... so always at least a bit heavy.This thing, on the otherhand, feels like a large plastic (light) brick... that can JUMP YOUR FREAKING CAR (multiple times). I've had a race car battery (Lithium IIRC) before that was similar in its mind-blowing weghtlessness, so it's really cool to see that in a jump starter.Truly insane.Pros:- It works- Nice screen- Holds its charge like crazy- Doesn't even use much juice to jumpCons:- Couldn't resurrect my long-dead battery... but no jump starter could.10/10