I left HTC a message on Facebook in reference to extended battery cases this is their reply
Me: Any plans on making extended battery cases?
OtterBox
We currently have one out for the Motorola ES400, that is our first test into offering an extended battery option. We'll see how it does!
Me: wow I hope it goes well because I would love one for my HTC Thunderbolt, Hey for all the AC people that love the Otter box cases lets hit them up with requests for extended battery cases!
Me: Any plans on making extended battery cases?
OtterBox
We currently have one out for the Motorola ES400, that is our first test into offering an extended battery option. We'll see how it does!
Me: wow I hope it goes well because I would love one for my HTC Thunderbolt, Hey for all the AC people that love the Otter box cases lets hit them up with requests for extended battery cases!