Well, the charging could be accomplished by a 'smart surface' such as Toshiba are starting to look into for charging their laptops.
(If you're not familiar with the concept, it works kind of like a grid of cells on a surface that contact with a similar surface on the base of the laptop. Once they can talk, they both can figure out such things as polarity, voltage and current - and the PSU configures itself for the slave device)
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