Methanol has been showing potencies to be the power source of the future for mobile gadgets. It promises way longer lifetime compared to similarly sized lithium ion batteries and contains less harmful metal too.
Toshiba said its 100-milliwatt version is similar in shape and size to a pack of gum and can power a flash-based player for approximately 35 hours on a single 3.5-milliliter charge.
Now, since I have worked with chemicals, I can assure you that 3.5 mililiter is quite a small wonderful amount of liquid if it can be made to power an MP3 player for 35 hours. It will be suitable for those outdoor weekend where wired electricity is non-existent.
I think we should keep an eye on this one technology