Meet the MiLi Power Skin for iPhone 3GS
I wasn’t all that impressed with the design of the MiLi power pack — it was good looking, but it wasn’t anything that Mophie hadn’t done yet. This MiLi Power Skin, on the other hand, is a real looker that’s just a hair slimmer than Mophie’s Juice Pack Air, while still maintaining the 1200mAh battery. There isn’t an on/off switch like on the JPA, but you can tell the device exactly when to charge your iPhone by pressing the power button. As a bonus, the Power Skin uses the now-ubiquitous mini-USB port, so you can have your pick of cables, should you lose the one that comes with this charger.
One of the best places to get this case still seems to be the aptly named Powerskin.co.uk, where you can purchase one for about 75 USD.


Looks good, actually better aesthetically than the Mophie. But $70+ for either option? No thanks, not when you can get practically the same functionality at Monoprice for $18. I've had mine for a few months, no issues and works great, particularly useful for travel.
http://www.monoprice.com/products/product.asp?c_i…
Yikes, that's one hell of a price drop. Pretty amazing if the build quality is as good!
I have had the Mili Powerskin for a couple of months now and have had nothing but problems. Not actually with the charging unit itself but rather with OS 3.1.3. I consistantly get error messages that the device is not compatible and it becomes annoying when listening to music and the music is stopped to display the error dialog. I wrote Mili regarding this problem and they responded by saying it was an issue with 3.1.3 and that Apple was aware of it. I have not used the Mili since.
I just received (yesterday afternoon) my newly purchased Energizer case from NewEgg.com for like $20 shipping included. It looks very similar to what you posted, has a battery indicator, doesn't mess with reception, and charges through the mini-usb. I actually loved the Morphie when I tried it, but it cracked my 3gs (just hairline, but still) and it massively reduced signal (like the 3-bars of 3G to searching for signal). The FuelMate case at Walmart costs around $70, also charges the same way, and doesn't reduce signal. You also have the Walmart warranty advantage of trying it for a month and then returning it for the full price. In my opinion, $70 for 1200mAh is outrageous.
will check that out later today, thanks John