It's the first time I hear about this new battery feature. I usually run my camera on Procell, it would be a great thing to be able to use my phone too on this specific type of batteries, this would give me more mobility in charging it. I need this technical feature as I travel a lot.
Guy Goma Kewney has pictures of a lovely mobile phone battery solution from MWC - the Philips 9@9j mobile phone takes not only a custom Lithium Ion battery, but also has a slot to take a regular AAA battery to top up the main battery for another three hours of talk time. If I was travelling, and I had the option to strap in a standard cell to my Symbian phone, I would be right there.