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.

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!

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

Excellent Product

Excelente performance

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.

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

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.

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

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.