I'm glad I wasn't the only one who noticed this. that's the first think I thought of when I saw it in my subscriptions feed.

TheDiceAreLoaded Right. First thing I thought of was "30 round magazine" (PMAG brand).

+TheDiceAreLoaded Noticed that in the first few seconds. It has the ranger plate as well.

+TheDiceAreLoaded I at first glance thought they used one as the body but then he opened the box.

TheDiceAreLoaded i noticed that too. however there is an advantage to it. with a carabiner you van hang it if you had longer cables, so is doesn't fall in during starting.

He did.......... Just an hour or so ago

Didn't even watch the video, but awesome comment! 600 Amp jump starter sure is a lot.

Laptop users seem to be the main ones that get caught out - Many can't figure out why their battery fails within 2 years, saying they only used the battery a few times and always kept their laptop plugged in, not realising what the constant 100% charge was doing to the battery. This also explains why UPS batteries are still lead acid.

+Seán Byrne True, but trying to keep your laptop battery at 70% constantly is not practical at all. You would be better off by unplugging the battery, but that would leave you unprotected on power outages, which most people wouldn't want.

+Hr Gwea I'm not familiar with Li-I or LiPo batteries. How would you know that you were at 70%? Could you charge it until you saw a certain voltage on the multimeter: if that works, what would the voltage be? If that's not the way to do it, can you tell me? Many thanks, B Bear

In general, my experience has been that that's right -- but cheaper units seem to be more likely to have a charge limiter on the lower end but not on the upper. Not all, but it's hard to tell what does and what doesn't.

because the battery was a good battefy

Benzin O1 That's a good idea. Lithium batteries don't like temperatures below 0c which unfortunately is when you are most likely to need it.

+knurlgnar24 Agree. I live in the NE and my experience with car battery problems have almost always occurred when it's bitter cold. I would be interested to hear about a freezer test before purchasing one of these and falsely thinking I was prepared. If you do a freezer test would appreciate a heads up...and I'll keep an eye open for it.

Motel Prius no, I doubt it. I need to start a 3 l diesel, will see.

HockeyStickLegs Yes, no problem but it won't last very long.

umbrefawx Thanks for the info! The voltage suggests that it is Li-ion but I may be incorrect. It is a pouch style battery.

***** lithuim ion and lithuim polymer batteries use the same voltage for the most part. Pouch cells are lithuim polymer cells but even so, are still a type of lithuim ion. Lipos usually range from 3.7 to 3.8 volts on newer ones. Typically lithium ion batteries (like the 18650 cells in laptop batteries can be ethier/or 3.6 on older ones and 3.7 on newer higher discharge ones. So even so the batteries are different as far as chemistry, there is such a thing as a 3.7 typically lithium ion and a 3.7 volt lipo. So its not hard to get them confused. They even have newer lithium polymer (lipos) which are higher voltage. (think they are rated to 4.35 volts nominal and charge up to 5 volts.) which could be both a good and bad things as the newer 3.8 volt lipos charge to that 4.35 volt nominal range of these new lihv batteries as they called them, but as far as I know they are still in testing perpouses and require a totally different lithium ion battery charger.

umbrefawx But maybe it should be added that even so the difference between batteries as far as that marginal extra voltage. Both regular lithium ion batteries and lithium polymers (lipos) can be chagred the same way at the same voltages. (4.2 volts though for lifespan reasons as you mentioned in the video, its better to keep them around 4.1) only exception to this really is the newer 3.8volt ones that charge to 4.35 but even so with a slight loss and capacity can still be charged to 4.1-4.2 like the others with a small amount of capacity loss. (but still longer lifetime beneifits.)

+umbrefawx Great video! Thanks for sharing. Maxmade jump starter is indeed an ideal driving companion, very useful, portable and convenient. Visit bizarkdeal.blogspot.com/2015/12/maxmade-400a-peak-current-jump-starter.html , you'll find all the details. Happy New Year 2016. :-)

+knurlgnar24 I've seen these disassembled, they use a Hobby R/C style Lipo battery. The EC5 connector is a dead giveaway. Lipos are ideal for delivering massive amperages over a short period of time.

sandman x It would perform excellent when 130F, but won't last long. Store it 70% charged or so and you might get a few more years out of it than storing it fully charged. Where lead acid is strong is in the storage energy per dollar. This lithium battery may be great for jumping a car or two, but it won't work well for powering an air compressor since it will quickly drain this tiny battery. This is part of the reason why car makers still use lead acid.

elektrinis ....74 mOhm is indeed far to high. When set is cooled down to minus 10 degrees C. The resistance, however will drop by about 12%. That's to say, the copper resistance will do so. With 10 gauge copper wire, all wire resistance is about 2 mOhm at room temp.most of the rest is resistance of pcb traces, solder (!!!) and internal resistance of the semiconductors. At an 80 Amp load, the heat loss of the wires is about 13 Watt, while the heat loss inside the switching box is about 500 Watts.....standard starter motors are made for 10 volt (in 12 volt cars) and are 1kWatt for passenger cars with 4 cyl. Motors. That require 1000/10= 100 Amps starting current. So these losses at start are; starter...1000 Watt, wires...20 Watts, switch box....700 Watts.....quite hot I may say....IMO the switch box is by far too light designed.....and unreliable.....greatings

Lagm an I actually don't subscribe to any channels similar to mine. Not sure why. Perhaps I get enough of that sort of thing at work and would rather rot my brain on the more typical KZfaq content. :)

+paherbst524 dead short

Craig Nehring The D cell ones would only be good for charging a dead battery and may be useful, but I wouldn't consider them a true jump starter.

***** D cell alkaline can kick out nearly 17 amps at 1.2volts that is 20 watts, 8 cells would produce over 130 amps at 9.6 volts under a short term load, of course they are not rechargeable but do have a very long shelf life. The first "flashlights" were just that due to battery chemistry and configuration and could only deliver reasonable amounts of current for a very short time, they would recover in a short while to again deliver another burst of light. (9 lives indeed) We have come a long way!! I'd like to see a hybrid super/ultra capacitor battery box. BTW, great video as always

Craig Nehring Thanks for the comment! I looked up D battery specs and the 17A would be about right for short circuit amperage. This means the maximum power output would be at about .75V and 8.5A. (At temps lower than 20c alkaline batteries perform very poorly.) You would need about two sets of 10 in parallel - 20 total - to be similar in performance to this jump starter at room temperature. But you're right, D batteries could work for this!

***** Wow, not sure what I was thinking when I wrote this comment... 8.5A per string of 10 batteries, so you'd need 10 strings of 10 in parallel for a total of 100 batteries. Still, D batteries could charge your dead battery over the course of a couple of minutes enough to start the car if that was the problem.

Fern W I don't believe this one has 'true' polymer batteries, just lithium ion with polymer separators like a standard laptop battery is my assumption. Either way I have little doubt that it will start a large displacement V8 without issue when it's fully charged and in good condition. I cannot speak for other similar brands.

+knurlgnar24 if it's anything like what I've seen before its probably a bunch of 18650 cells.

Peter Carlson 18650 cells can't produce near that sort of current (100A+). It will be a pouch style lithium like you find in RC models. 18650's usually output about 5-10A maximum.

abyssunderground Yup, it is the pouch style. In my previous comment I mentioned that it is 'laptop style' which is misleading since most laptops still use cylindrical batteries. But both are lithium-ion in most cases and not true polymer batteries. The pouch style has polymer separators and are often referred to as polymer batteries in advertizing.

Fern W I can't speak for this particular model, but I used a similar jump pack earlier today to jump a 5.7l V8 that wouldn't turn over. Got mine from the local NAPA dealer for $89 on sale. It's called the Blue Fuel, but you can also get it from Amazon as the Shumacher Red Fuel. Exact same box just different colors. The battery technology is Lithium Iron Phosphate, which is supposedly safer than regular Li-Ion or Li-Polymer.

I'm guessing there are 8x18650 cells inside based on voltage and size of the unit. These cells can usually support up to 10amps max draw. Given that this device only needs to be used at high amperage for a few moments they're safe pulling a few more amps out for just a few seconds. TL;DR - Magic.

they actually do make lithium ion car batteries, they are way more expensive than a lead acid battery though and they last about the same amount of time. when you need to shave the last 20 pounds of weight off of a prize winning racecar it is worth it, but who wants a 5,000$ car battery that needs replacement every 2-3 years?

redneckbryon Peter's right. I actually recorded a segment where I explained why car makers use lead acid when lithium is, on the surface, superior but removed it from the video for length.

fliping720 The higher voltage helps them get more amps out of a smaller battery when connected to a high drain load. Professional jump starter services often use 18V batteries for the same reason. That isn't to say a 12.6V battery is in any way inferior - it's just an engineering choice.

***** yea it seems that way, just looks kinda hard on the battery.

12v most definately does arc. As we speak I am drawing 2-3cm arcs from a 3v psu. my stick welder runs only about 30v when its closed circuit. as long as you ionize the air the heat will continue to ionize more air and allow you to maintain the arc, think a jacob's ladder.

david wise Just buy a solar charge controller with MPPT function.

+Lau Chung Kyu wow thank you ill look into that I have ask a lot of people and got a lot of disinformation

+Lau Chung Kyu color me slow could you point me to one that would accept 36 and let the need voltage for a twelve volt system there are so many im lost

+Lau Chung Kyu www.ebay.com/itm/30A-20A-10A-MPPT-12V-24V-Solar-Panel-Battery-Regulator-LCD-Charge-Controller-CE-/301221639758?var=&hash=item462235764ethis looks like it works it a cheaper unit but the 30 amp one will work to test the panels I have at the moment

+david wise Don't buy this unit. This is a fake MPPT, you will spoil it with that high input voltage. Buy a higher price one.

+Tommaso Petrella i would get the easyjumper, it has a laptop output

kuhrd I thought modern cars required no more than 5V? It's not that I'm arguing with you but if you could link sources for the 8.5V number I would be interested in reading about it. Thanks.

not if you do it right. apple phones contain a lithium ion polymer battery too

Well, I can say that I am still alive at least... BTW your comment reminded me that I had a video I forgot to release years ago on this jump start pack so it is posted now. Thanks for your comment and support Denis!

@@knurlgnar24 It's so great to hear from you and that you are doing well. I know I sound as if I am exaggerating, but I have received countless hours of pleasure watching and learning from you. Just ask my wife - I probably drove her crazy analyzing and discussing your videos You created a whole new hobby for me -- off grid boondocking. Before running across your site, I was so far from knowing anything about electrical devices it was scary. You brought me up to speed quickly. Denis

+Brian Schwarting dead short

+Raul Galvez It's an old Morse code for Save Our Ship. It means "Help me". Of course no one today would have any idea what it meant.

There's a bit of advertising 'lies' in there, but for jump starting you only need a few seconds of high amperage so thin leads like this can still do hundreds of amps without overheating. The issue with jumper cable thickness is more about voltage drop than cable heating. These jump packs have short cables so they can get by with thin wires.

@@knurlgnar24 I work for an independent test lab.. on testing these we found out that ..yes most will put out 700 amps....for between 10 and 20 milliseconds.. then the drop to 300 to 400 for 10 to 15 seconds then all the protection and alarms go off. While this will start a petrol engine the diesel glow plugs eat up that valuable output.. so now you only have 3 to 6 seconds.. and it the main battery is dead.. its sucking some of that power.. so you often only have 3 seconds..

That's because it can't. Lol

well Dog My Cat.

+Rondo Schiavoni Who said anything about 12 degrees? He didn't start a car!

I thought the video was about using it for a car battery ,I could be wrong.

You need one in the boot for most of the time convenience and one under your bed, for those days when you really-really have to be on time for work on a winter morning ;)