Skip, SF1 or SF1n comes with a 2CR5 battery pack. It is the grip of the camera itself, where you see the big letters SF1. The 4 AA battery grip is a bit fatter, but goes the same place, as the handgrip. It is available separately. An ebay guy in Augusta, GA seems to have an endless supply. That or he never sells the one he has. At any rate, it is not an add-on part, but a replacement part that is integral to the SF1 itself. Regards, Bob S. << I've just about decided on buying a used SF1, probably from KEH, but I'm a little confused about the battery pack options; does the camera come with either an AA battery pack or a 2CR5 battery pack already built into it? Or are these options interchangeable and available separately, like with the FG style AA battery pack for the ZX cameras? Thanks, Skip >> - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .