I don't think you can yank the battery on the Aqua Fish (without a soldering iron and a stiff drink, anyway). But if you hold the power button long enough most phones do a hard shutdown don't they?

[edit - seems I'm wrong. I swear I read somewhere it was non-removable... edit 2 - gah, I give up, it says a different thing on each site. How damn hard can it be to get something like that right *after* a phone has been released if you run a phone review website? [Shakes head in despair]]