David R.
A really good piece of kit. Purchased just at the right time to get me out of a situation where no one around to help.
Started car up straight away.
Highly recommend.
Paul j.
excellent product and excellent delivary service
Cecil N.
It’s great, works every time it’s used even when. It fully charged. Highly recommended. I have only used for BMW M3. I have absolutely no complaints. I do not go anywhere without it.
GigaWatt
My son run's an automotive service part-time. He regularly is contacted by someone with a car or truck that won't start. After buying several Jump Starters a few years ago, he gave up on them because they either didn't work or didn't hold up under use. I ordered the Gooloo for him as a Birthday gift hoping this would be much improved over the previous models.After opening the box and picking up the jump starter, I could immediately see and feel the difference from models my son and I owned in the past. This unit is hefty, has stout well made case and a large easy to read display. The accessory kit has every cable you could need; Heavy Duty Jumper Cables, SC 100W Car Charger, USB to Type-C , Type-C to Type-C Cable, Cigarette Lighter Adapter and Storage Bag.With only 2 buttons to control the unit, it's easy to operate. Simply press the Power Button to turn it on. If your going to jump a vehicle with a completely dead battery, you need to press the Boost Button. A long press of the Power Button turns on the very bright Flash Light on the end. Pressing the power button 2 more times cycles the flash light through Strobe modes. This is handy if you have problems after dark and need light to connect the jumper.I wanted to test the unit but none of my vehicles had dead or low battery so I disconnect the battery on my diesel powered tractor. I had used the tractor earlier in the morning to push snow and left it outside in 20 degree temp for 10 hours. Since disconnecting the cables from the battery mimics having a dead battery, I had to push the Boost Button to get power. My tractor started immediately! As you can see at the end of the video, the tractor start only dropped the battery capacity from 98% to 95%.The Gooloo could also be used as a Power Bank for operating and charging other devices.At this time I'm giving it 5 Stars and will update the review after some use by my son.
Smily :)
In the freezing cold, jump started two of our vehicles right away. Lets you know when its ready. Easy to use.
Randy A.
It's a great Unit, It definitely has some juice. I ended up needing it about one week after I received because I left my lights on overnight in 9 degree temps. Got up for work and hit my remote start and didn't hear a thing. Instantly knew it was dead. This unit, even not being the one with the self heating, started my 4.7l v8 the first time with the boost function. (I had left the unit in the car overnight so it was definitely cold). Has a light, will fast charge your phone or laptop. Gonna try it out at work to try and start some diesels, no doubts at all.
j m wood
My wifes car was having, what we now know we needing a new battery. This jump started her car right off. Great to have for those unexpected issues.
Chuck H.
In addition to the GOOLOO pack I have a 2000 amp jump pack as well as another 4000 amp jump pack. Size wise, this is the largest of the packs I have, and probably the strongest. I have a 4.4 L gas engine, but the target engine is a 7.3 L diesel.As i've been increasingly taking my truck off-grid, i'm continuously looking at better options to be able to self extract. The GOOLOO product is intended to get me out of a no-start situation.The GOOLOO pack has a nice large LCD screen as well as a nice large light more COB in style than the other packs. The battery clamps on this pack are also by far the largest set of clamps for any of the packs and also the longest length of cables.Why is that important? In most BMW��s the battery is not mounted in the engine bay - but rather some other part of the vehicle for better weight distribution. What this can lead to is posts that are mounted in the engine bay, but spread out further than your typical battery. The GOOLOO have plenty of length where this is not an issue.Since my batteries are in good shape, I could not test the low battery scenario. So I tried to simulate a dead battery situation by disconnecting the batteries. I was able to get it to crank, but not start. I know I need 10.5 V to the computer to actually get it to turn over, so I don��t think I was getting enough voltage to the computer. That does indicate that in a low voltage setting, I should be able to start the truck. More testing is required, but so far this is pretty promising.In comparison, the other 4000 amp jump pack, would not even turn over the engine.So the package comes in a nice box - not unlike apple product packaging. So in general - a pretty nice package. It also comes with a storage bag, but not a semi-hard case like some of the competition.If I were to make a suggestion, i'd spend less money on the box, and upgrade the storage bag to a similar semi-hard case. That should allow all the parts to stay in place, and not get separated from the jump pack.Other than that whine, a very capable and solid product.Well done.
Gordon Arch
The Gooloo JSPB GT4000s is heavy and large. Much larger than my wife's X-10 starter pack. You need to plan on storing in the trunk or under the rear seat of a pickup. Most gloveboxes will not store this thing. I did test on my diesel mower and my 6.2l GMC Pickup without the battery attached and the truck engine spun like normal. No sign it was something 1/4 the size of the battery under the hood. With the unit comes several connectors for various uses which is a nice bonus. I did purchase the storage hard case which is a separate purchase and I will review it later. The one thing I like about this and one of the reasons I think the unit is so large, the battery clamps don't have that large block on its cables. On other units "clamp wires" there is a large block which is the protective circuit indicator and alerts to the crossing of wires (positive on a neg). This Gooloo does not have that large block on the wires yet does have cross wire protection and those circuits must be in the unit itself. This may seem like a non issue, but storing the cables with that big "wart" on the wires was always a challenge for me.
Frank R.
Liked first one so much I purchased 2 more for rest of family. Charges fast and jump start works awesome.
John y
This is probably our 7th Gooloo we have purchased for ourselves and friends as gifts. Highly recommended.
David G. Fitz
I used it to jump start my 3020 john deere tractor and also a Ford F-350 pickup. Pleased so far.
Infinite3
Powerful unit to keep in your rig. It boasts a 24 month charge retention so we will see about that but it fired up the Mercedes diesel no problem!
Richard P.
I like this one because it doesn't ever have any issues like the other one that I purchased which was a different company. The other one will not hold a charge very long.
Warren P.
Works like it's supposed to.
Jason H.
Works as advertised. Simple, compact.
Persephoni
This is probably our 7th Gooloo we have purchased for ourselves and friends as gifts. Highly recommended.
Pierre D.
Small and powerful
Frank Johnson
I needed it today and the device worked. Car started right up.
John Smith
Nice looking, easy to use, good quality, fast shipping. Hope good support in future.
Lily Anderson
I was recommended this product by a friend who had one and I was not disappointed. It arrived in time in a nicely package box charged easily, and I��ve already used it once to help a friend. I would totally recommend this.
Todd I.
This is my first time using one of these.
I have already had the need to start 3 dead battery's. Unbelievable how well it functions with a completely dead battery. Still at 95% charge.
Zbigniew J.
Used this 4-5 times, had it for 14 months, no longer works. It��s charged, says ready, no output. Regret buying this, I should have purchased the Noco I originally planned on.
Christine T.
Received the GOOLOO GT4000S Jump Starter super fast and was ready for its first use when it arrived. Had to jump my Jeep Wrangler 4 times and didn't hesitate at all. I would definitely recommend.
Brian Johnson
Several complaints with the GOOLOO GT4000S
1. The product does not come with a 'lightning charger'. without the lightning charger it will take hours for the device to charge even a small amount. I used the supplied charging cable to charge top off the jump starter and after 4 hours of charging the display indicated a 5% increase. it will take days for the jump starter to charge using the supplied cable.
2. The device does not work in cold weather. Temperature was -15F and my car battery was old and would not start my vehicle. When I tried to use the GOOLOO jump box the screen showed an E4 on the screen, beeps constantly and then automatically turns off.
3. The jumper box will not take a charge as it only shows an E4 on the screen, beeps and then shuts off after 30 seconds.
my advice is to purchase a different device, this one left me stranded and simply does not work.
Katarina Anderson
I bought this for my truck, the next day at my job site I saw the siding crew trying to jump start a 80' diesel man lift with their super duty truck and cables. I offered this jump box, the contractor looked at it like a toy, then said it wouldn't work.
Thirty minutes later of him trying to use the truck he gave up. After he left I connected to the lift battery, it immediately would crank, but not start. Three clicks of the boost button and it the engine started right up!
Pretty impressive for such a small device to start a huge diesel engine, even when connecting to a super duty duel battery truck couldn't get it.
Justin Walker
I will be sending back. They went cheap. No case. For sure you will lose all the parts.
I hate it when companies just try to deliver cheap to make profits. Charge more and give a great product
MnMCruncher
WOW! The best packaging and presentation as well as product design fit and finish available. Dual use flexibility in an indespencible tool to do what is needed in an emergency as well as function in daily life as a charging brick for electronic devices! Safe and reliable jump starting for larger 10L diesel, 12L gas and 12v (golf cart style) batteries.
Dan A.
I've had this for a month or so, used primarily for charging laptops/Ipads, worked well, like my other lithium ion battery packs but more capable. Recently left fully charged in my truck for several weeks in freezing temperatures. This morning, I attempted to start my truck, (6.4 L/392 cu in V8) and the battery (AGM H7 from Napa) was so low it wouldn't even unlock the doors. I used the key to get in and hooked the GooLoo up. It was still reading 100% despite being mid 20s, truck instantly cranked like it had a fully charged H7 under the hood. GooLoo still read 96% remaining.
William C.
Did exactly what it was supposed to do
Vicki D.
I purchased this item with the intent of using it for my off roading trip. As soon as I took it out of the box I heard a sound of something big rocking loose coming from inside the casing. You can hear it in the video. It does not come with a rugged case either. I do not trust the build quality of the product at All! I have two different ones from other companies that I'll be taking with me on my trip that I do trust.
Kevin C.
Even though I have had it for over a year I have only recharged it one time. Now it is useless because it won't recharge!
Wayne P.
Powerful unit. Holds charge a long time.
Valerie S.
This device has enough battery power to start an 8 cylinder engine, however, the cables are too short.
Stephen Y.
I bought this for around $100 and it has saved my son from being stranded 3 times this -30 degree minnesota winter. Priceless when you NEED IT. Thanks good product.
Pierre D.
Should be a required item in every car!! Easy to use.
William Blake
You will think this is priceless when you are in a parking lot with no one around to give you a jump. Highly recommend this product!!
Rebecca James
On line purchase of the Gooloo GT4000S. Within a week of receiving it I had to use it to start my car. I had already fully charged it. Car started immediately. unhooked it from the battery and noticed that 95% remained, then powered it down. Decided to top it off the charge before storing it. Charged back up to 100%, but would not turn on after pressing the on button. The device repeatedly showed 75% when I plugged in back in, but still would not turn on. Using the information recommended in the product manual, I tried contacting GooLoo via email and customer support number. Email address did not work, someone answered the phone once then pretended to have a bad connection. After that they repeatedly hung up on me. Email came back undeliverable. I just sent it back for a refund. If you are fortunate and get a good one, you probably should consider purchasing the extended warranty. The associates at gooloo highly likely will avoid helping you after the sale.
Richard P.
Used this to jump my 4 wheeler and it worked without issue and it didnt even phase it. I also lost power for 48 hours due to a storm and it was able to keep my phone charged throughout the night battery percentage never dropped below 90%
Marc D.
I finally was able to test the battery jumper since my Subaru battery went dead due to parasitic drain from being idle for a few days.
The super booster feature did work for me. Subaru Outback battery started in the first try.
Preston
I am blown away at the bang for the buck you get with this jump starter.
First off, it arrives 80% charged. I immediately charged it to 100% and load tested it. It held the rated 4000 amps for the full 5 seconds of the test - unheard of in these devices.
Secondly, the display (which is mounted behind a translucent film) is big, bright, and easy to understand. All of the auxiliary functions performed flawlessly and the included cables and adapters leave little to be desired. The interface panel is clean and standardized to accommodate DC5521 devices, as well as standard and boosted USB-A outlets. The 100W USB-C (in/out) connector makes charging super quick. (the only downside is that you need to already have a 100W USB-C charging brick. Lesser wattage bricks will also work, albeit a bit slower to charge)
The only thing that would have made it perfect would be a hard case to store the device and accessories. (comes with a nylon bag) As I have just received this device I cannot attest to it's longevity. I will try giving an updated review after 6 months.
Steven W.
I tried starting my small engine and it went into error mode (E3) when the engine didnt start right away. I didnt even crank it over for more than 10 seconds before it stopped working. It then is in error mode for 10 minutes before resetting- you cant just reset it manually. It did this everytime I tried to start the engine. Not useable unless your engine starts instantly.
Tom P.
This going to be great when traveling. No more worries about finding a jump if the battery fails. Easy to change between vehicles.
Steve D.
So far, this product has completely met my expectations. I have not had battery issues for several years, but both my vehicles have the original batteries in them and are several years old. After reading several reviews, most brands of these do their job well. A week after I purchased it, a friend called to say that she had car trouble, and I went to check what the problem might be. Dead battery. I hooked this device up and the car started like it was connected to a fully-charged battery. This unit was charged to 100% before the jump and was at 98% after. Now, she has my jump starter, and I am ordering another for me.
Johnathan S.
I tried for over a month to get a replacement for a defective GT4000. It won't charge properly. Still under the 18 month warranty but they will do nothing. Very bad product and company.
Refugio A.
As a portable battery bank, this thing is pretty cool. It charges itself fast, and charges devices fast. I would say, however, that this blew the 20a cigarette fuse in my truck from drawing too hard. It ramped up fast to about 120w, then *POP*. I replaced the fuse, and has been fine sinse.
Now, for the real purpose of this device, which is to start a vehicle, I can't really tell you if it works properly or not. I have two 6.7l diesel trucks, and both are having dead battery problems as the batteries hadn't been replaced in maybe 6 years. I actually already have a lithium battery jumper from another brand that works great, but really just wanted an excuse to splurge and upgrade a little.
The first time I used this jumper, I put it on a truck that sat dead for a few weeks. Voltage before attempting to jump was 8.2v. I Attached the jumper as ussual and pressed the boost button, then you saw the percentage gauge dump extremely rapidly. It went feom 100% to 34% in the span of a few seconds without even cranking the engine yet. I'm not sure what happened, but as it turns out, it fried the fuse panel. Something shorted and caught fire on the inside. Did the jumper cause it? I don't know. But, I feel like the jumper should have some type of ground fault detection at least. If it does, it didn't work that day.
Second attempt at using it was on another truck. On this truck the voltage before starting was 10.1v. When I attached the jumper and pressed boost, the percent dropped from 100% to 79% like normal. The issue was that it didn't start the truck. Not even close. Ifor several attempts, it got in maybe a quarter crank, then turned off every time. I went and hooked up my old lithium jumper, and it started up instantly, which leads me to believe this one doesn't truly have 4000a. My other one is only about 1800a, and it worked fine.
Not sure what's going on. I'm not an expert at these things. All I know is it didn't work.
Johnny K.
I love it. My battery went dead, and literally within 3 seconds after connecting the device to my truck battery, I crunk my truck up. This is a life saver!
Patrick
I drive a diesel, excellent product my alternator was bad batteries were dead, and hooked up the gooloo 4000 on each battery crank up within 30 seconds of hooking them up excellent product work very well helped many people out that was in a bind definitely recommend
Erik H.
It looks solid and i like the big digital display but very disappointing to see a cheap carrying case. Cmon Gooloo you can do better than this. The smaller/cheaper version comes with a nice case and the expensive one comes with a cheap case. Makes no sense.
Wise
In the freezing cold, jump started two of our vehicles right away. Lets you know when it��s ready. Easy to use.
Kjell L.
My wife��s car was having, what we now know we needing a new battery. This jump started her car right off. Great to have for those unexpected issues.
Dariush
Good quality and works well. I do wish it came with a better case than a storage bag though.
First test was installing it in our RV without a battery. Was able to fire the generator up easily.
Handsome
I used it to jump start my 3020 john deere tractor and also a Ford F-350 pickup. Pleased so far.
LUIS H.
This things works great! The week I bought it my kid's vehicle had an alternator and battery issue that required using this to start and basically run his vehicle for a week and a half. Battery lasts a lot longer than if expect. Great product with awesome protections built in
Tiresha Z.
Works great. Easy to use.
Richard P.
This came to the rescue during last week's snow storm in ND. I got to use this for the first time as my son's car wouldn't start. The battery was completely dead. We had to jump start the car 3 times before the battery light turned off & the car stayed running. This little pack was a beast. I like how it showed the battery level. I recommend this to my family & friends.
Tina
Liked first one so much I purchased 2 more for rest of family. Charges fast and jump start works awesome.
Francis Z.
Have had trouble since day one with this junk! Never works, just blinks and never cuts off. Also wont start a car cause its too busy blinking some random bs. Youd be better off asking a stranger for a boost than carrying this garbage with you.
Ernest L.
Bought this instead of carrying jumper cable's. I've only had one occasion to use it and it worked great.
Marc D.
I like its power and simplicity.
HOW TO JUMP START
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