Pulling battery off to a smartphone is like unplug the power supply on a desktop PC or unplug the battery in a laptop PC. Smartphones are complex devices with true OS, RAM, memory and so on. Be gentle.
Inviato dal mio HTC Desire S usando Tapatalk
Ok, that's normal. Also the freeze is not good for data integrity.
But reading Reaper thread and this thread too, it looks like that pulling out battery from Desire S is even worse.