It looks like there is a new battery being used in the S200 and S330.
NB-1L 680 mAh
NB-1LH 840 mAh
Both charge in the same charger, are interchangeable but the NB-1LH has a claimed life that is almost double according to one of the review sites. I've been thinking about a second battery and extra capacity would be a real treat.

