WAY:

My dealer just sent me the Porsche product news on lithium battery.  It sounds like it is superior to a normal battery for daily use in every way (except cost obviously), and can be changed to a lead battery easily.  Is it possible to post PDF files here so I can show you guys?

 

The Porsche configurator states (in German):

Lithium-Ionen-Fahrzeugbatterie (18 Ah) zusätzlich beigelegt. Zum Einsatz z.B. auf der Rundstrecke anstelle der serienmäßigen Fahrzeugbatterie mit einem Gewichtsvorteil von über10 kg. Hinweis: Eingeschränkte Funktion bei Temperaturen unter 0°C. Anmerkung: Frühestens verfügbar ab 1/2010,

In essence they say that the battery is provided in addition to the normal battery, that the lithium battery can be quickly installed when you go to the track and that it does not function properly at temperatures below 0°C. Thus, they do not recommend it for regular use - they see at as a special item which you quickly install on the track Smiley