Solar Charging Shield

Hello, I just received my new version Solar Charging Shield. (10-23-2010 US or 23-10-2010 Other) It comes with a 9 Volt battery unit with leads. The Data Sheet and Schematics say only 6 Volt max. Do I need to step down the 9 Volt or is the Datasheet/Schematics out dated with the new version?

9 Volt battery holder that was supplied: