GOOLOO 4000 Amp Jump Starter GT4000S Car Starter 100W Two-Way Fast-Charging Portable Car Battery Charger Jumper Starter for 12L Gas and 10L Diesel Engines, SuperSafe Jump Box for 12V Vehicles

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I bought the GT4000S because I have a Ford Excursion with the large 6.8L Ford that has sit in recent times because of surgeries. I inevitably forgot to unhook the battery and after many weeks of sitting, it runs the battery down. Most recently a door switch began acting poorly and caused the battery to drain quickly. 2 weeks post surgery and the battery read less than 3 volts on a DMM. Tried a traditional pack I have (Stanley MAXX 1000A) and it turned on the lights but never attempted to crank. The GT4000S however, was very easy to set up, with one connection to the unit and essentially two button pushes. Out of the box and to my surprise, it immediately turned over my engine and started my Excursion with little effort. Only took 3% from the batteries charge as well. The display is basic but gives pertinent information. The unit itself is ruggedly built and its features are pronounced. The USB-C connections will charge everything from a laptop to a phone with ease. It will vary the voltage based upon the need of what is being charged. For jump starting, it will not let you hook up the terminals incorrectly and will indicate to you that you have them incorrectly placed. It recharges quickly, but is limited in the USB-C to <50watts when not connected to a dedicated 100watt charger from GOOLOO, which more than doubles the 1.5 hours to over 3 hours from dead, but isn't a huge concern as I plug it in overnight after using it then place it back in my truck in the morning. Overall, I am impressed with this unit and cannot say enough about it. Its compact, comes with a charging cable (USB-C to USB-C) jumper cables, a carry case (nylon type of sack), and a hefty manual. Couple of tips, if it has trouble starting the car because the battery is drained to near zero, press the button once to put it in boost mode, and immediately start the vehicle. Invest in the hard case kit that is sold for them. Well worth it and ensures that screen is 100% protected.

Necessary for any car or RV and roadtrip. Just bought this for our son leaving for college. Almost everyone in our family carries a Gooloo in their car and have for last 7 years. We even used it recently to jump our $15K RV lithium battery bank. Easy to use, reliable, you're never stranded and always have power for phone charging, etc. They retain a charge for very long periods (my experience 2 years and more without recharge) and recharge quickly. A must for any loved one to keep them safe and independent. Faster to Gooloo jump a car than jumper cables- throw the cables away and don't wait for another vehicle to help. I use before calling AAA.

There is a version of this device that will pre-heat the device in extremely cold weather. Make sure that's what you get if you're in very cold places! This one does NOT have the heater and being in a car overnight in the 20s or below means it needs to warm up to about 50 before it will deliver full charge. Trying to jump with it before it warms up can damage the thing or it simply won't do anything at all. But, cold weather issues aside... it's a very good performer, jumps most anything the first time without any problems, even batteries that are so dead they won't even register as a circuit when the box is hooked up (digital display does not turn on to indicate it's detected a battery). For occasional use one will be good - just charge it up once very month or two (it'll loose less than 10% a month while in storage). If you use them daily like I do you'll want two or more. While very good they are very, very sensitive to overvoltage and will drop into safe mode very, very quickly and it takes upwards of 10 minutes before it'll reset itself. And they discharge relatively swiftly... 7 'dead' cars or 10 'weak' cars, at most, before they're below 20% charge where it'll begin to struggle. Type-C charger means it'll recharge *FAST* - about 90 minutes from 0 to 100% at a wall outlet with a decent outlet charger (20v min). 2+hrs with a standard car utility outlet (5v).

I needed to replace my tired booster pack so i first watched the Project Farm review. My favorite from the PF review was "last year's model" of gooloo. Looking into the specs and the fact i live in a northern latitude where it's typically 0F or -18c when i need it, i picked this model that has an internal heater to warm the battery for jump starting in winter! The other big improvement with this model vs. others is how crazy fast it charges! At 125w, unless I've drained the battery dead using to run my air compressor or computer, it will be topped off with 15 minutes drive. I bought it when my main car battery was failing but it was under warranty and it took a couple weeks to get the store to understand the battery was shot even though it would pass the cold crank test because they would charge it immediately before testing! Anyhow i needed to use it daily for a couple weeks and then I've used a dozen times helping others. It's beyond powerful, i won't bother trying to find a different brand. The display is comically large but it's beautiful! Customer service is top tier! They stand by their product and are very responsive, reason alone to buy gooloo. They have a bunch of models you don't need to get the very best one especially if you have a small car and live in a warm climate. We were having temps of -10f or -23c when i bought mine and that was factored into why i bought the high end model. This unit is very well made, crazy solid construction, and you can sense the quality from the heft.

Works great. I bought 3 of them last year. Have jump started many things in the past year, 2 of them actually jump started a 24 volt 16.2L Liebherr engine. My only complaint is when it is overloaded it will flash an error code for overloaded and wont seem to reset until it sits for about 10 min. Does not feel hot or anything. This is a problem if you can not get something to start and youre cranking the engine for a while. Also ran into an issue once where the battery was so dead it would only stay running while the jump starter was on it. It only stayed on of about 10 sec at a time, not long enough to atleast get the truck off the trailer. With everything said im still very happy with the power of these jump starters and would buy again