Unbelievably fast charging!
340042
Unbelievably fast charging.  Usually have to wait hours for a full charge.  Satisfying to know I can plug in my almost dead phone and a short trip later, have enough charge to know my phone won't be dead if I have to get out to do chores, shopping.
2654797
Great charger - does everything I need it to do!
3530277
So far this thing is awesome. The 2.1A USB port provides a very fast charge for my iPhone, Galaxy S3, or iPad. The built in flashlight doesn't really add too much value, but I guess in a pinch it could be helpful.

I am curious to see how many cycles the batter pack can go through before it becomes less useful. Hopefully it will take a while. I'm very impressed so far.
3203304
This charger is great for those days you just can't be waiting for your phone to charge!  It charges so quick it amazing!  When I saw it I thought I'd give it a try! I'm sure glad I did! You definitely can't go wrong!  I highly recommend this charger for yourself or for a gift!
2020945
I made this purchase after my rabbit chewed through my other Galaxy charger. I wasn't expecting much other than "I hope my phone charges faster than other off brand chargers I have bought. This charger was great! my phone goes from 13% to 100 % in what feels like 30 minutes. I set my phone down and before I realize its completely charged. I have since bought 3 more of these chargers. I keep one at work, at home, in my purse and in my car because you just never know when you might need a quick charge.
1820802
Amazing product extremely durable and quick charging!! Definitely recommend
4526670
Charges extremely fast! Will charge about 15% in a 5 min drive! Works great
83599
This Thing Charges Really Fast If You Have A Phone That Supports Quick Charging.
2485134
This is an absolutely fantastic product.  Incredibly fast charge for my iPad and 2 android phones at once.  I leave it plugged in while sitting in bed before going to sleep, and it is charged before I nod off.  I will by buying another unit for my office.
2688186
This thing is absolutely incredible. I charged it up ONE TIME and it has charged my Galaxy S5 COMPLETELY over 3 times and its still at 66% full! I'm thrilled with it, and its more than I could have ever hoped for. HIGHLY recommended!
572324
Charges extremely quickly; much faster than a regular charger.
3041494
Bought this originally to fast charge my phone, but discovered it could fast charge my tablet! I didn't even know it had that capability! The brick that came with it didn't fast charge it. I highly recommend you buy this charger and discover if your devices have the hidden capability. Even if it doesn't still a better charger than your original brick!
4345957
I am in LOVE with this battery pack! It is one of the most solidly built packs i've owned to date, surpassing my mophie which, while slightly smaller, also only had 10,000 mAh.  It has a sleek outside with a weird repeating sharp design that makes you think quality.  The red portion, while a nice contrast, is not as similarly beautiful and has more of a functional look.  This thing charges insanely fast and also fills up pretty fast for its size.
2466070
This battery charger is so fast, I charged my iphone5s from 0% to 100% in less than 30 mins! I still had juice left to charge other items. I am impressed! Going to buy more, it's so small and affordable!
2762821
This charger worked almost twice as fast as my other portable charger! My phone was at 13% and in an hour it was at 100%. The charger still indicated that it only used 1/4 of its power to charge my phone. I love that the indicator lights let you know how my power is stored in it. The four blue lights on the charger will all be blue if it is at 100%. 3 blue lights mean 75%, 2 at 50% and so on. So I can charge my phone 4 times before I need to re-charge the Poweradd Slim2! That is fantastic. I got a great deal on this item in return for testing it out and leaving my honest opinion in the form of a review.
2816033
This is a super fast charger. All phones plugged in charger in an hour or less.

It came with the box and a separate charging cord that has a power box attached to it. The cord is long as well.

I can have all four ports plugged into something and charging and it doesn't slow down the charge on any of them.

I own a Samsung Galaxy 7s and it charged lighting fast. I was shocked at how fast it charged. I decided to put a load on the charger by playing a game that normally drains the battery and causes extremely slow charging. This charger not only kept charging it kept gaining in charg.

All in all I was extremely impressed and happy with this charger.
656860
Ohmygosh, this thing is AMAZING!!  Being in the tech industry (among other things) I have certainly seen my share of portable chargers and power banks.  Generally they are pretty much the same as between those with the same ratings.

But this Savfy (how *do* you pronounce that, anyways)... it's a thing of beauty!

Listen up folks:  In order to test and review this, I plugged my phone into it last night..*17 hours ago*...and it's only used 25% of the Savfy's power.  That means that from one charge of the Savfy, I could power my phone - keeping my phone at 100% charged - for more than 50 hours (probably more, but I'm estimating and rounding down because as batteries run low they seem to tend to run down faster).

FIFTY HOURS!!!

And it has not one, but *two* USB outlets so you can charge two things at the same time (I'm sure that will decrease how long you can charge for, but it will still be an insanely long time).

Yes, it's a bit bigger, and a bit heavier, than other power banks.  That's because it offers a whopping *18000* mAh!! (mAh is a measure of essentially how much energy the battery can store.)

Other external battery packs / power banks can range from 3400 (that's two zeros) to 10,000, and *still* be larger or bulkier!

The Savy is about the same width as an iPhone, and about twice as thick, and an inch or so longer.

A few notes:

- There is a cool little led light on the end of it.  You're going to want to use it as a flashlight, but that's not what it is.  It's just the indicator light.

- There is a little indented button on either side of this thing.  You're going to want to press them.  You can't, because they don't  press in.  I have no idea what these things are for, but they *do* make it easier to hang on to, because the case is very sleek and slippery.

-  In the pictures, the case looks kind of metallic.  It's not.  It's  hard plastic.

- You might be tempted to use just any old micro-USB cord you have hanging around to charge your Savfy.  Don't - use the cable that came with it, it charges up crazy-fast!

UPDATE 2/27/16:  Not only is this thing incredible for all of the other reasons I stated above, but it holds a charge like crazy!  I just picked it up for the first time after writing this review - so...it's been 2 days shy of a month - and it still was at 100% charge!!! (To be clear, that is with it being *unconnected* to the charger.)  WOW!!

-  In full disclosure, this company sent me this to review, however I am not bashful about giving my true opinion of a product (hey, I'm a lawyer, just try to *stop* me from giving my opinion! :~) )  I genuinely love this thing! In fact, it's one of the best products that I've ever received to review since I started doing reviews!

-  If you want to establish my credibility about things like this (i.e. tech and electronics), one of my publications is The Internet Patrol, in case you want to look it up. :-)