GS4 Extended Battery Recommendations Please topic

Hi all,

Looking at maybe getting an extended battery for my S4, but I want to keep it as slim as possible, while also being worthwhile having though, no point something with a useless battery gain

I really like the design of this one where the phone sort of 'slots' in for two reasons:

1. I think you can use the original battery as well as the extended?
2. I like the way it doesn't look like it will add too much thickness

http://www.amazon.co.uk/GooseWhite-3...tended+battery

Only thing is that has useless reviews

Does anyone have one they would recommend?

Thanks! :)