Yeah, terminology.. a 'hard reset' in the mobile world usually means 'back to factory setting, delete anything installed by user'. Anyway, removing the battery while the device is up and running is _not_ a good idea, unless you're forced to do so e.g. because the device is unresponsive to buttons. It's like pulling the power chord on a desktop PC - you may end up with corrupted flash and memory card. Better shut down the operating system first.