After reading many reviews, I decided to purchase this case, and I was NOT disappointed! the case arrived in a matter of days & had some charge already in it straight out of the box, meaning I could use it straight away! one of the really nice features about this case is the dual charging functionality; you don't have to remove the phone to charge the case, simply plug your micro usb cable into the port at the bottom of the case and leave it to charge; it'll charge your phone AND the case at the same time!! Also, the price of this thing is incredibly cheap compared to other cases on the market & i doubt you'll find a case as good as this, for the same price or less!
In terms of battery life, i can get 2 full charges from the case, providing I do only use the phone minimally whilst it is charging. otherwise I get at least 1 & a half full charges from it. However, I still tend to plug it into a socket overnight to charge my phone & make sure I've got a full charge in the case for the next day.
As of Yet, I have had no problems with the case & I was initially worried leaving it plugged in overnight might effect the battery in the case, but it hasn't.
in addition to this, the fact that there is a kick-stand integrated into the case is also a nice added feature, as it allows for a hands-free experience when watching movies.
The only downside to the case is the slight bulkiness of it, (which i've noticed other people commenting on) but it is not as bulky as others have made it out to be, trust me! After all, what are people expecting it to be?! the battery needs to be somewhere! :)
All in all, This is a great product & I would 100% recommend to anyone looking to get it to buy it! you won't be disappointed!!!