Extended slim battery?

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Does anyone know if it's on the market extended battery original size?

I think that would be like trying to get a quart into a pint pot!
Unless someone comes up with more advanced technology larger capacity will bring larger overall volume.

Batteries with the same size of the original one have a maximum of 1.300-1350 mha, like this:

http://www.wireshop.it/prodotti/cd_1...49067714601984

But I don't know if it really has a longer life duration than the original one, because I don't never try it.
However its purchase could be useful, because it is always a replacement battery.

I've found this battery, don't you think that the price is too much low? I could face fire on the phone??

Well i recieved today my 2200 mah battery with extended cover i buyd on Ebay it came from england and i payed 10 € for it.
Its marked made in China but the original marks the same so ??

Greetz Andy.

But I would to know if anyone had a good experience with a slim extended battery....