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GOOLOO GT4000S Jump Starter 4000A Portable Car Battery Charger 12V Booster

High-Power 4000A Jump Starter & 100W Fast Charger for 12V Engines Up to 10L Diesel/12L Gas

(84 customer reviews)

$99.99$189.99

GOOLOO
Today price savings: -47%
Rating: 4.6 out of 5 stars
Opinions & Reviews: 1607
SKU: B09M9HQG73/com Category:

84 reviews for GOOLOO GT4000S Jump Starter 4000A Portable Car Battery Charger 12V Booster

  1. Jerry

    Started a 8 Cyl 6.6 L Duramax, with both batteries disconected

    I decided to disconnect both batteries from my 8 Cyl 6.6 L Duramax to test the GT4000s out. First try, the starter clicked and then dash went dark. Rechecked the connections. The truck started on the second try and even ran about 5 seconds off the pack before I shut it down. 4 stars because even though it worked, It felt like it was pushing its upper limit and unsure how it will hold up over time. I did find the cable length to be ok but could be a little longer. I ran a small portable air compressor briefly from the cigarette plug adapter, it worked but drained the battery quickly.

    Variation: Color: Red / Reviewed in the United States on March 11, 2025
  2. Lou FXDB

    Just buy it!

    This jump pack is no joke. Used it for the past couple of months and it’ll jump start John Deere 8Rs like nothing. It does good as long as the battery isn’t completely dead on the big 9 liter tractors. It’ll jump at least 3 tractors on one full charge. This out performs my coworkers Noco GB150 3000 amp. YouTube the project farm channel that compares different jump packs. This is one that they test and the biggest bang for the buck. I definitely recommend it!

    Variation: Color: Red / Reviewed in the United States on March 7, 2025
  3. Tater

    top tier buy!

    Must buy in this price range! Will jump a completely dead battery. More importantly Project farm approved!

    Variation: Color: Red / Reviewed in the United States on March 6, 2025
  4. Frankie

    Great

    Excellent Product

    Variation: Color: Red / Reviewed in the United States on March 5, 2025
  5. S@amy B

    Happy after almost a year

    Excelente performance

    Variation: Color: Red / Reviewed in the United States on March 4, 2025
  6. michael doherty

    Works like a champ right out of the box

    This thing just works. I purchased this particular unit because all of our vehicles are diesel. And according to the listing details it should be able to accommodate jump starting each of those vehicles if needed including my 6.7 liter turbo diesel ford f 350. So here is the story: I moved our 2017 land rover discovery td6 out of the garage so I could paint the garage walls. Six hours later when I went to move the vehicle back into the garage it wouldn’t start. I don’t own a pair of jumper cables. This was on a Saturday. So I went on Amazon and ordered this Gooloo jump starter. It arrived overnight at 6:30 am on Sunday morning about 70 percent charged. Hooked it up to my SUV and it immediately cranked right up and started. Went to auto zone and they verified the 7 year old original battery was bad. So an hour later, new battery installed and I am a tru believer in this item. Carry it with me everywhere now.

    Variation: Color: Red / Reviewed in the United States on March 3, 2025
  7. xwossiex

    It works

    10 out of 10 recommend It works perfectly, jumpstarted our car a couple of times no complaints.

    Variation: Color: Red / Reviewed in the United States on March 3, 2025
  8. bubba

    get one

    this has come in clutch several times to help other people out of a bind. today, it worked to jump off an F550 diesel with two battery system. plenty of power. holds a charge well.

    Variation: Color: Red / Reviewed in the United States on March 3, 2025
  9. Lukas

    Great Product And Works Great

    This is an essential item to have in my truck (F150) at all times. Works great and very quick and easy to use.

    Variation: Color: Red / Reviewed in the United States on March 1, 2025
  10. Elijah Dowdell

    Great little Jump Starter!!!

    I love this Jump Starter!! Ease to use!! Starts in seconds and light weight. It more compact the the big balky ones and has power like the big ones. A most have in any garage or vehicle emergency kits.

    Variation: Color: Red / Reviewed in the United States on February 26, 2025
  11. Ricardo

    Doesn’t charge

    Reached out to customer support since it came with a card to reach out to them in case there was something wrong with it.. they did not respond so I will be returning this item for lack of customer support.. if they reach out before I drop it off at UPS I will update this review accordingly

    Variation: Color: Red / Reviewed in the United States on February 25, 2025
  12. Bill P.

    Great product

    Works great and holds charge for a long time

    Variation: Color: Red / Reviewed in the United States on February 22, 2025
  13. Amazon Customer

    Dead after 4 months!

    After 100% charge 4 months ago, I find it dead this morning when I needed it… now it won’t even charge… hoping company will replace it, as I’ve emailed them… their phone number does not work!

    Variation: Color: Red / Reviewed in the United States on February 20, 2025
  14. Ryan Williams

    Won’t need to purchase anything else

    I have used this to jump start my vehicle along with my neighbors vehicle on several occasions. He has a Silverado that had been sitting out for a little while. He attempted to start it and use a different battery pack. I was able to set this up within a minute and start this truck without issue with this still having a decent charge. Like that it gives you a digits display of how much percentage is left. It is slightly heavy but well worth carrying just in case. The bag it comes in is very convenient and holds all of the extra items that come with it and is easier to carry it around. I don’t imagine I would need to purchase another one but if I did I would definitely get another one. Great product at a great price.

    Variation: Color: Red / Reviewed in the United States on February 20, 2025
  15. William Wyllie

    Yes please

    It worked great, once. Died after second charging. Was so disappointed because I liked it so much was planning on buying more for gifts. After I used it one time I plugged it up and charge it to 100% and it died never seen anything on screen again. The kicker is I had time on warranty to get it returned but didn’t realize I was in a rush so I missed it by a week. I believe they are sending me a replacement now even though I was a little out of the warranty picture so I’m very happy with it again.

    Variation: Color: Red / Reviewed in the United States on February 19, 2025
  16. Chess

    Starts truck engines and all smaller engines

    I haven’t tried starting a diesel, but a standard V8 starts up. So far after 4 months very pleased with the unit. Makes for a great USB charger when camping too.

    Variation: Color: Red / Reviewed in the United States on February 18, 2025
  17. Erin McKim

    For our boat

    We love this so much, always have it on the boat with us just in case! And it has come in handy to use when others have issues on the water!

    Variation: Color: Yellow / Reviewed in the United States on February 18, 2025
  18. Amazon Customer

    Most amazing thing ever. 🙂

    This is the coolest thing I have ever bought off of Amazon. When it gets cold, out Jeep decides not to turn over. Every single time, I just pop it out of the back, plug it in, you don’t push anything and start it up. It’s 100% and it goes down 2% on every jump with a Jeep. So you get so many jumps without having to do anything. And you can keep it back there forever it seems, without ever having to charge it up, which takes like 1 plug in the wall for a few hours. I could not say anything better about this. Get it for anybody that you don’t want to ever have to ask someone else for a jump.

    Variation: Color: Red / Reviewed in the United States on February 18, 2025
  19. Tomi Deng

    this item only has plactic bag !

    this item brings with the car for long time , it only has the plastic bag , but it has lithium battery ! so terrible for that !

    Variation: Color: Red / Reviewed in the United States on February 15, 2025
  20. Mauricio Escobar

    Not a good jumper pack

    I got this jumper pack because I owned a gp200 and it last me for 6 year or more with no problem and I put it to the test with diesel engines but jumper pack gt4000s is no good I’m disappointed 4 crankshaft and you have to wait 10 to 15 min for it to restart and if you do roadside service like I do, this will make you look bad like it did to me. I mean it goes to error mode trying to start a atv

    Variation: Color: Red / Reviewed in the United States on February 15, 2025
  21. larry

    EZ Jump start

    I have used the jumper on a heavy duty truck, a 75hp tractor, multiple small engines (ATV, mower). Easy to use and easy to store. i bought one to carry in both of my vehicles and my work truck.

    Variation: Color: Red / Reviewed in the United States on February 15, 2025
  22. R. Ashby

    Wouldn’t start my truck

    Fully charged, it wouldn’t start my truck, kind of disappointing

    Variation: Color: Red / Reviewed in the United States on February 14, 2025
  23. Ryan Mills

    As described works great

    I’ve only used it once but it worked flawlessly and is made very well.

    Variation: Color: Red / Reviewed in the United States on February 12, 2025
  24. Bo Juergens

    Very useful

    This charger has saved my butt more times than I can count. With so many things needing a jump or boost, this really is worth the price. I’ve used it on a large SUV, sports car, boat, riding mowers and just about anything that can benefit from its use.

    Variation: Color: Red / Reviewed in the United States on February 11, 2025
  25. Edwin H.

    FAST CHARGE!

    Not used yet but still want to post this review in response to other reviews. I bought 2 units for our business. The first unit was at 76% charged. The second was 80%. You can definitely charge these with 100W USB-C chargers but you will need to have the correct rated cable and have a charger that can provide the 100W…remember that when other devices are on the same charger the charge rate per connection drops! I will update this review after real life use but wanted to post this already to rebuke the claim that 100W charging is not possible.

    Variation: Color: Red / Reviewed in the United States on February 11, 2025
  26. Ashton Oram

    Waste of money absolute trash

    Hookup up to a Gator with a new battery. Cranked it over a bit and it stops into a safety mode as it detected 4 starts in ten minutes and not won’t work for ten minutes. Does not matter that it is cold out and those cranks were a second or two long. Went from 100 percent to 62 in that time, took it off an noticed no difference. Waste of $100. Do not buy. Was the best from project farm review but still not worth $20

    Variation: Color: Red / Reviewed in the United States on February 10, 2025
  27. PJ

    Powerful

    Worth every penny. Easy to use and powerful. Just helped jump my diesel. Highly recommended.

    Variation: Color: Red / Reviewed in the United States on February 7, 2025
  28. jcolbs

    WORKS GREAT!

    I have used it multiple times since receiving it just 2 weeks ago. Yes, I replaced the battery in the vehicle I kept having to use this jump box on. Friend of mine said that’s thing is awesome! I’m getting one

    Variation: Color: Yellow / Reviewed in the United States on February 6, 2025
  29. John Clark

    Good for big engines

    Started my old v8 mustang first try. Lots of power. Kind of expensive and heavy but does what I wanted. Will have to see how long the battery lasts.

    Variation: Color: Red / Reviewed in the United States on February 5, 2025
  30. fpc

    Don’t plan on charging at home without buying a charger

    OK, I get that most folks have a USB charger but when I buy a device to jump start a car I expect to be able to plug it in at home to charge it. And the mealy mouth language about not including one for “environmental reasons” just annoys me. Which, I guess, is obvious. Last GooLoo device I buy or recommend.

    Variation: Color: Red / Reviewed in the United States on February 2, 2025
  31. RB

    Great purchase!

    Got this about two weeks ago. Just helped someone with a dead battery at Lowe’s. Worked great started the SUV right up. Temp was about 11 deg F.

    Variation: Color: Yellow / Reviewed in the United States on February 2, 2025
  32. Charles Hudson

    Great unit

    very compact and easy to store under the frount seat I used it the 2ED day after arrival

    Variation: Color: Red / Reviewed in the United States on February 1, 2025
  33. Amazon Customer

    Great

    Everything so far

    Variation: Color: Yellow / Reviewed in the United States on January 31, 2025
  34. Customer 4321

    Disappointed

    This is my third Gooloo jump pack, and unfortunately, I’m disappointed with its performance. The clamps aren’t strong enough, which leads to arcing and triggers an error code, rendering the unit unusable for several minutes. Additionally, it only allows for a single crank before entering safe mode, requiring another long wait before you can try again.

    Variation: Color: Yellow / Reviewed in the United States on January 31, 2025
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