Works fabulous with my rechargable back to my phone. ...
936948
Works fabulous with my rechargable back to my phone. I've had it on for a few weeks and it is holding up well-no color transfers as I read about in other reviews but I also keep it in my purse, not my pocket.
3393210
This is a product that delivers charging===>BOTH BATTERIES= the Cell and the built-in  battery inside the built-in case...it comes with an extension adapter plug and the usual connecting/charger cable.  It is a LIFE SAVER..when your phone gets low level and just  by switching the back button to green..it will give you a full 100% power back....by one and say goodbye to looking for a plug to charge it!
3879497
I have an In-Home child care and during the summer, we are out on field trips almost every day.  I must have a working mobile phone with me at all times.  I've used solar chargers and adapters in the past to try to keep my phone charged and ready to use.  The biggest problem I've had with either of those choices is they don't charge the phone faster than what I'm using it for.  I use the GPS a lot as we try to visit as many new places as possible during the summer.  The Anker has taken care of that issue for me.  It charges up my phone incredibly fast!  I would have paid twice the price for this adapter!  I am amazed every time I use the adapter at how quick it recharges my phone and it doesn't matter what I'm doing with my phone at the time of charging.  I would highly recommend this adapter to anyone with a Galaxy s4.
2062496
I am so excited about this...my charging port in my phone stopped working so I was not able to charge with a cord...with this, my phone is totally saved and happily charging again!  YAY!!!  Design is also super sleek and lights up blue when charging.  Love it!
1710147
Works great. I have used it a number of times to charge both my phone and tablet. I'm often in areas where I have a poor signal so my phone and tablet are rapidly drained. This is the perfect backup! It's a little heavy to carry around in my purse, but when I know when I need plenty of power, I know what to take! Headphones, tablet, phone, everything charges super fast with this! And it holds a charge for a long time
2396171
Update at the end..
I love this charger. It has given me freedom from cords and walls. I just pop in a battery and I'm  on my way. I also used this brand charger with my Galaxy S3. It was a no brainer for me. I know of no reason why anyone wouldn't  love this. Oh and it comes with 2 batteries so I have 3 batteries! I never panic about losing a charge  or preserving my charge. The greatest thing because  it keeps me from damaging the charge port on the phone like I ALWAYS did with cords!!!

Update: shortly after writing this review the "filler end" of the battery fell out which resulted in the battery dropping from the charger and my phone occasionally shutting down randomly. This end of the battery seems to be is for aesthetics mainly  but  it has affected  the charging  and powering  of my phone because the battery is no longer a snug fit in the charger or my phone. This never happened with my previous purchase of this type of charger for my galaxy s3. Of the three batteries that comes with the charger two of them are missing this end. I would really love to see them replaced.
4643210
My husband ordered this for me on a recommendation from a friend. I have to say, I was skeptical at first. BUT, out of the box I got 3 full charges on my phone before needing to recharge the unit. Full charge from dead took about an hour to hour and a half. I am very pleased with this purchase, especially at $15. My husband earned brownie points too. I would definitely recommend this to anyone who is on the go.
1204220
Excellent addition to this phone. Now I Always have enough power to get through my long day....
505372
Fantastic. I use this as my primary charger now, I haven't charged my phone from the wall in over a month. This charges my phone faster than the quick charger that came with my phone. I use the microUSB that came with it to charge my phone and keep a spare IPhone charger in the bag because some friends and co-workers are so impressed with the speed that they use it on occasion as well. I only have to recharge it once every 5-7 days, which I typically just do while I'm asleep so it doesn't disrupt the use anyway.
It's worth using a quick charger to charge it though. It will charge fully overnight on a quick charger, but took about a full day when I was using a standard one.
Just bought a second because it works so well! One to leave in the car and one to keep in my bag
3289517
Really appreciate charging my spare battery and phone at same time. Great for syncing as well!
1269735
I take a daily 1-1/4 hour exercise walk and speak with my friend the whole time (women!).  On several occasions, I have had to end the conversion, much to my dismay, because my phone runs out of power. My husband and I both use LG phones, which charge with a micro USB port, so this little, rather stylish white and gray Enerpak, works perfectly with the supplied USB - Micro USB cable.  By the way, the description says it's integrated, but the cable is separate from the battery pack.  Note, if you have a phone or tablet which doesn't use a Micro USB to charge, you will need to supply your own cable, i.e. any Apple product.

It is compact enough, 3-1/2" long x 1" wide x 3/4" high, to just slide in your pocket or purse.  The instructions provided are very clear and in much appreciated English only.  The initial charge took only about an hour into a USB 2.0 port.  I really like the cable design, in that you charge with the Micro USB into the battery pack and you plug your phone in by reversing the cable so the full size USB goes into the battery pack.

While charging the two red lights glow and when fully charged they turn green. There is no on/off switch but the battery will shut off within 1 minute when not in use. A wrist lanyard is also provided. From the packaging to the instructions to the battery pack itself, it's evident UNU has produced a high quality item, very fairly priced.

I will truly enjoy my uninterrupted critical daily phone calls with my good buddy. Highly recommended.

A sample was provided for review.
1432410
Great product! On a recent vacation I used my iphone camera constantly and that depleted the phone battery by mid-afternoon. It was so great to have this charger in my bag. On the way from place to place I'd charge my phone...brought it to 80-90% within an hour. Was wondering if it would work so well given the low price but that's just a bonus. Perfect size and works well.
3736832
excellent...i am always on the go and run out of battery life on my iphone...when in a meeting i just plug it in anywhere and recharge my iphone...
4170575
Really nice for charging my phone from a portable backup battery.
1022648
Im so glad I bought this. The only problem is traveling through customs. They had to check my bags 
I went to a festival and all of my friends (we were like 5 people but had to share the 3 ports) where desperate to charge their phone. Luckily, I have mine. They charge like 3 times each (fully charged) and it wasn't even drained. Just the half of it!!! Amazing!!! I don't mind having it charge for 8 hours cuz normally I would leave my phone to charge overnight (which you shouldnt do for all phones) so I charging my powerbank very safely :) I hope they produce a wireless charging  ANKER FOR THE WIN
3851995
I bought this in preparation for being in the woods and away from electricity for an extended period of time.  When charged with an actual power source, it works great.  It brought my Samsung Galaxy S6 from 0% battery life to 100%, and still had some juice left to assist someone else.  I tried to rely heavily on the solar charger part, however, from charging from 0600-1900ish, solar charger part only offered one bar of power.  I would not recommend this device is relying on the solar charger alone.  However, I am pleased with how well it managed to recharge my device.
2515760
I love this battery charger. I am able to take advantage of the full capacity of my new LG G5 phone. It doubles as a portable battery pack and comes with another cable so I can power other USB chargeable things as well. I am very glad to own this great quality product, and see it being an accessory of great use. The price, as well, is right up my alley. So, the quality, usability, practicalilty and price are ALL a huge 5 stars in my book#