So you've got an HTC ThunderBolt extended battery. Can't blame you there. Now you need a case that'll fit it. Enter the Seidio Surface Extended Battery Case for the HTC ThunderBolt. It's redesigned to fit the extended battery, but doesn't mask any of the phone's functionality.
Let's start without even putting the case on. The inside, where it touches the battery cover, is covered in felt, so you won't scratch the cover. You attach the case by starting on the side with the volume rocker, then snapping on the opposite edge. (You remove it in reverse.)
Once the case is on, the sides and rear of the ThunderBolt are completely covered. There are cutouts for the volume rocker, camera, flashes and microUSB port. The exterior of the case is done in soft-touch. It's got just a tad more of a plastic feel than the ThunderBolt's stock cover, but you might not even notice. The case covers the ThunderBolt's metal kickstand, but has its own plastic kickstand to replace it. It's not as elegant as what's on the phone, but it'll get the job done.
The case extends past the front of the phone just a millimeter or so, which should keep the glass from being scratched when left face-down.
The Seidio Surface Extended Battery Case for the HTC ThunderBolt fits the 2750mAh and 3200mAh extended batteries and is available in the Android Central Store for $27.95. We've got more pictures after the break.