Ooook! So today I have received my aftermarket 3800mah extended battery via ebay strait from china. I can currently tell you: The back cover is a lot more streamline looking than I expected though it is also fatter than I expected. I can say it is a perfect fit for the warp though it does not snap on quite as tightly as the stock back cover. It does however have a nice feel too it, not slippery at all and my grip does actually feel a bit more steady with the slight extra bulk. I have wiped the battery stats, shut her down and am now doing the first charge on it to see how this monster battery actually holds up. More info coming soon.