Battery would not charge past 49%. I changed chargers ...
934704
Battery would not charge past 49%.  I changed chargers and did other things noted by folks having the same problem.  Returned item.
2831571
My phone used to turn off at 70% I was thinking on replacing it. But after this battery it back to normal.
1680089
The charger doesn't charge the battery up 100% and I have put two bran new batteries in the charger.
801413
*Update 4-5-2016

I purchased this just over a year ago and about a few months ago, this device would stop displaying the correct battery percentage level. It would remain at 67% regardless of how much I charged the device. Furthermore, a month ago this device would go to 0% even after I charged the powerbank for hours.  This has happened on multiple occasions and it is odd that this powerbank crapped out after the warranty ended.

*2/24/2015

I charged my IPhone 5 when it was at 89% battery and the Intocircuit device started at 100% and went down to 93%.

Also, I attempted charging the phone about 5-6 times as I kept getting an error message of 'This accessory may not be supported'.  I have an Apple certified charger cable but I had to plug and unplug the cord and try charging it from both 2.1A and 1.0A port before it finally recognized my device.

The device itself is very bulky.
4706081
is not charging 100%.After 65% is turning  off. Is not working for me:(
3582046
Revised review (July 9, 2014):

Battery sent to me fully charged (late June 2014) when placed in charger. IT APPEARS TO Working great for now. However, you can not let the battery get below 20% charge. Otherwise, even when you charge it all night, it may say 100% charged on the Samsung IIIS in the morning. When charger is pulled out like this am went down immediately to 75% charged. So I make sure I charge it every night. When new, this battery actually went to 100%. At this point, I believe this to be a SAMSUNG issue unfortunately. Jocelyn and her team provided me a rapid turn around. Funny thing: The customer service rep wanted the serial # on the battery as that is how they track their orders-Strange again- Most companies track by invoice #: Told her I was calling on the SAMSUNG smart phone. She helped me never the less.

The customer service support is great for now. We shall see in a month or so if this battery continues to function. I understand Lithium Ion batteries always have issues. I will let all know.

--------------------------------------------------------------------------------
I based my decision to buy this extended life battery due to its 7200mAh rating and feedback from other buyers.

So here are the facts regarding my usage:

1. For the first week the battery held a charge but never ever was able to charge up to 100% when left overnight. Even though the battery indicated charged to 100% on the Samsung Galaxy S3, when disconnected from the charger, level fell immediately in the 90s and then after 10 minutes to the 80% range. It still will not really charrge to 100% over the past several weeks I have had it.
2. I had WiFi and Bluetooth disconnected as a test.
3. In the second and later weeks, about mid afternoon or early evening, I got the audible warning that battery level was 15%. The brochure with the Anker says wait till 10% battery availability left. At 10% the phone camera will not work.
4. The battery doubles the size and weight of the phone.
5. I have bought other after market other batteries for this Samsung and they did not fall apart so fast. Same with a Blackberry I had.
6. Summary:
I feel that a. Either this is a dud battery that has lain in the warehouse forever or b. It may be a bad battery from a better batch but no Quality Assurance by the vendor before shipping it out. or c. There may be no QA for the battery production process and d. It is definitely not worth the $37 or so I paid for it.
7. In the future, I intend to Yelp every vendor and their product and look at all user feedback from Amazon and other sources. Hopefully, the vendor will make me whole with a new battery that works as advertised.
90123
I used up the charge it came with and tried to recharge but it did not accept even 1% charge even after 12 hours.  Like an idiot I had assumed it would work and outlived my 30 days return time.  So I am screwed.
947361
When I got the Trend I charge it for 24hrs like it says to do and it did not charge. So I put  the battery in the extra charger I bought and it still didn't charge. It look like it my have been return before so I sent it back and will not be buying another one.
3152630
Did not ever fully charge. 120% charges advertised, It did not charge my phone past 80% (from ~35%) after being fully charged. I tried charging it for over 24 hours straight, letting it die completely then charge for over 24 hours straight & uninterrupted. I returned this defective product.

To be fair, it was replaced and the new unit works as advertised.

BOTH the returned and replacement units have an issue with the volume up button- it sticks sometimes, MOST of the time I have to use two hands to press it as it is very difficult to press to the point where one hand doesn't cut it. That said, the trick to fix it (most of the time) is readjusting the phone in the case by pressing it farther down.

Otherwise it looks sharp.
3557687
received 2 batteries.  Put both in the charger and it indicated they received a full charge.  On the first try the battery turned the unit on and when I was about to put in info the battery  died as the unit shut down.  Again put it in the charger until it indicated  a full charge.  Put it back in the unit and quess what - the same thing happened.  Used the  second battery - no problem on the first  try.  Recharged the first  again - to day it worked.  Let you know next week how it goes.  Tks  Jim
4341936
Battery would not charge. I had to return it and ended up going to Batteries Plus and got one that worked great.
4403098
The first battery I received didn't charge at more than 1 AMP through either port.

First there customer service said that is the max it can do. After I copied and pasted the information on their website that says it should do 2.1amps out of each port for a max of 4.2 amps, they changed their mind and said they were wrong at first.

I received a replacement and it was the same way.

I sent both back and I am receiving a refund.

I might have received two duds, but I don't think I did. Be warned that this product won't meet it's specifications!
2657875
Not sure if it the solar charger or the batter pack, but it doesn't charge the batteries up to 100%. It seems to stay around 50% to 65%.
4787059
The replacement battery matched the requirements for my T43 laptop.  Unfortunately the PC went wonky every time the battery was a part of the system.  Even with the charger attached, the PC crashed or froze countless times after swapping out the battery.  Much to my amazement, all of the problems disappeared when moving back to the original-yet-aging battery.  In the end, my solution was to stop using the battery completely.

The battery arrived on time and yes it fit properly, etc.  I seriously question whether the internal charging smarts of this unit is fully compatible with the specifications of my PC though.
4581807
The battery will not charge to 100%. Since the first 100% full charged, the battery won't charge more than 89%. Very disappointed. If this continues for next few days, need to return it.
2647990
After a few days of use the battery would not hold a charge. The battery charge would go from 100% to <50% as soon as the charger is unplugged. I would not recommend this product.

Update: The initial battery failed after a few days of use and would no longer hold a charge. The seller sent me a replacement battery to replace the defective battery. After about a week of use, the new battery seems to be working fine. I did not give the product 5 stars due to the initial trouble of getting a faulty battery. Great customer service by the seller.
4279356
I got this and it was at 42% when it came. I charged it fully and now it says that there are 3.5 hours remaining. I will update this if the product turns out to work better than it looks, but as of now I seem to be worse off than I was before I bought this replacement battery.