Waterproof & Extra Battery Life

So far I'm impressed with the Mojo Refuel Aqua case, but is there any other competition in the waterproof/battery case market yet? Anyone have an alternative? So far the only one I can find is the Snow Lizard SLXtreme.

Do I understand you to mean that you are looking for cases that are both waterproof AND provide extra battery power? If so, I think you've found the two options.