how are you finding it? i get frustrated with it quite quickly (WHY can't i edit one drum loop and copy it to all parts, rather than go into each pattern and edit them individually??), but guess it's cos it's not technically a fully fledged sequencer.. synths sound good though.. and some of the crazy japanese with four ds's seem to do amazing things with it..
My battery died about half an hour in to playing it. I reall yneed a new battery, the one I have lasts me about an hour and a half now, fully charged. It was a second hand ds, so I don't really mind.