I now have these batteries and cables in stock:

Swit Battery S-8972: Westside A V Studios WEB Store (http://www.westsideavstore.com/index.php?p=product&id=67)

They fit in the FS700 and uses the Sony charger. They also have a power tap that I make a cable for the Alphatron EVF (my favorite EVF). This makes the most compact and easy way to use an Alphatron on an FS700. I also make a cable that can use your existing D-tap cable from the Alphatron that plugs into the Swit, so you can use either D-tap battery or the Swit.

As you may know I also have a compact shoulder system and very adjustable rugged EVF mounting system in my WEBstore, that can accomodate AB or IDX batteries etc. I also have the new compact 15mm rail kit for the 700 in stock now.

Sony FS700 shoulder brace (http://www.westsideavstore.com/index.php?p=product&id=65)