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Every schoolboy knows that most of the human body's latent energy is lost through the top of the head.
Why not invent a hat, possibly made of metal (see link), that channels this energy to spent batteries, which can dangle off the brim of the hat, much like corks on a stereotypical Austrailan bushman's
After a brisk walk, the batteries will be fully charged, ready to be employed in electrical paraphernalia of your own choosing.
Soid Gold Hat Shop
Where to buy metal hats [kpx, Sep 19 2001, last modified Oct 04 2004]