Any opinion on this "battery case"?

I used to own that one before I dropped my 925 while drunk :crying:
It charges your phone while on the go, so I like it.
 
Ah, okay. So it sounds like you've liked it. :D
And wow. 90 dollars, though...

Battery cases always cost more. I spent $85+ dollars each for the two that I bought for my iPhone back in 2011. But they're really worth it since you get all that extra juice for your phone plus some protection thanks to the case.
 
Thanks for the feedback, guys! I might be investing in that one at some point. And it really is a shame the phone doesn't have built in wireless charging..