2300mAh Rechargeable External Battery Back Case for iPhone 4 - Black

Pros: Very useful! Fits great on iPhone 4S too! The battery is great, i will never stay out of battery again! Almost two times the battery of my iPhone. Its lighter than a lot of normal cases on the market. Love it!!! The case is hard, so its hard to break too, very good job making this case with battery.

Cons: Nothing, the product is great the way it is.

Other: Very satisfied with the product.

Pros: I recommend this, though the battery covers input is standard (iphone) connection. Good if you have other accessories to your iphone, which means that you do not need to remove the battery cover at any time... Another thing that is good is that the standard charging input, does not give you problems when charging, as most of the converted micro USB- to iphone input.

Cons: The cover can be perceived as a little plastic, though the fit around your iphone is not a hundred percentage, even though you won’t drop the iphone out of the cover it is still a tiny gap at each side between the cover and the iphone (which can be noticed if you look close enough or carefully shaking it from side to side).

Other: Best battery cover I have used until now. experienced user :)

Pros: Haven't test the battery for actual capacity but both charged up my 2 iPhones from 10% all the way up to 100%, recharge the phone again and it went from 20% to 50% and then stopped. I will say the stated capacity is true. The battery cases use the same iphone 30 pins connector, there is a charge LED indicator that turns between red and green to tell the charging status, only you'll need to peep through a tiny hold on the bottom of the case that right next to the connector to see it. The case is rubber coated which is quite nice but I have no idea how long this coating will last. The case fit both my iPhone 4 and 4S quite well. There is an on/off switch so I just switch it on whenever my iPhone requires a boost. Very handy.

Cons: I ordered 2, one has a loosen battery inside the case. However, it doesn't affect the performance. The rubber coating seemed a little too fragile, some places had been rubbed off after a few days' usage. The charge indicator - the red/green LED are hidden inside the case at the bottom, have to peep through a very tiny hole to check.

Other: A very good battery case at a very reasonable price.