This external battery works very well.
I also feel it may hold more charge than my iPhone 4.
Instructions are a tad vague, but it is pretty simple.
Press the button on the back to check the external battery status. Flick the switch on the bottom to charge the phone.
It works, and works well.
However, I've taken 2 stars off because of the design.
At the time of writing this, there are 3 x different versions. One with a lid, and two without.
I purchased the one with the lid.
The lid is awful. It flaps around and feels like it wont last long.
The volume buttons don't quite line up, and it's virtually impossible to switch the speaker… Read more