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So I picked up one of those small battery booster packs that are now being sold, the price was too good to pass up. My question is how can a small battery the size of a notebook put out 750amps of starting power? (its apparently able to boost trucks and diesels as well) I have one of those larger batteries that are the size of a normal car led acid that state they do 600amps.

Is this just marketing or are these new compact Lithium batteries that much better?
 

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I have one. I carry it in the saddlebag. I have yet to use it, but it is a nice piece of mind to have.
They call them "Booster" packs because that's what they do, they boost or add to the original battery, between the two you should be able to start any vehicle.
It may not work if your car battery is totally dead. Of course it all depends on how much current the booster pack can deliver.
The expensive ones that can deliver a good punch should be able to start the car on it's own, but you will only have one or two chances at it.
The thing I like is that they hold a charge for about a year. I charge mine in the spring when I put it in the bike and again in the fall when I move it to the car.
I keep it in the passenger compartment instead of the trunk in the winter because it isn't as cold there.
 

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I keep it in the passenger compartment instead of the trunk in the winter because it isn't as cold there.
How does it take being in a freezing cold vehicle over night? my garage is not heated and as with you winter is here now and temps will get well below freezing.
 

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No battery likes the extremes of hot and cold and their performance degrades linearly as temperature. At freezing, you're running about 50% of it's peak. Remember though, with the battery packs you are only supplementing your car battery for very few attempts. Two of them working together is what gets your car started.

As with other batteries the performance of the booster packs will vary model to model. Batteries is a product where you really get what you pay for.
 

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How does it take being in a freezing cold vehicle over night? my garage is not heated and as with you winter is here now and temps will get well below freezing.
The temperature in my garage in the winter goes to about -10C or -15C. I check the meter on the pack from time to time and it still shows fully charged. They do seem to last a long time.
As I say, I keep it either under the seat or in the glove box since it will be warmer more times than in the trunk.
I haven't used it yet, but still glad that I have it.
It also has all the other stuff like flashlight, USB output and comes with a bunch of charging adapters. It would be good to use for camping.
 

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Is this just marketing or are these new compact Lithium batteries that much better?
It's not just you. Lithium Ion is just about the latest technology for battery power. It has actually been around for a while, though the technology took a beating a few years ago. Like all things, the greatness that is Li-Ion has its downfalls too. Remember all those laptop, cell phone, and Vape mod fires? Yep, Li-Ion. It REALLY doesn't like to be over-charged. They also don't like to be beaten or stabbed. The newer versions (and more expensive) have electronics in them to monitor the charge to prevent fires. They do hold a charge longer than a standard battery, but once they fall below a certain level, they are a lot harder, if not impossible to recharge. I'm a little bit of a flashlight nerd, and many of the expensive super bright flashlights use 18650 li-ion batteries.
The benefits of Lithium Ion is it is lighter and provides much more power than a standard battery. Yes, this means you can actually run a smaller, lighter battery in your bike or car and save on weight and space. They hold a standby charge MUCH longer than a regular battery too. That is why you can carry around that little jumper box in your trunk for a few years, and when your battery craps out, hook up the cables and start your car.
 
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yago20 covered it all about Li-Ion batteries, except for a couple points; if your bike doesn't start the first time in weather, there probably will not be a second try. And in the cold, a Li-Ion battery needs to be warmed by turning on the headlight(s) for a bit before attempting a start.
 

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I don't have one with car or motorcycle connections. But I do have one I carry in my briefcase for when I need to recharge my iPhone and/or an iPad. The one I carry is about the length of two packs of smokes but not as thick or wide. It's a fairly inexpensive itek brand from Soundlogic and it's only 12000mAh with a 5V, 3A max output.

What amazes me is that it will re-charge my iPhone 6 and my iPad 2 simultaneously several times before it needs a charge. Easily a dozen times with an iPhone and I know I've charged my old iPad several times from nearly dead as well.

I've seen the ones at mc shows where the sellers are talking about starting a bike or a car. Pretty sure I'll end up with one in my saddlebag at some point.
 
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