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Looks like a fuel cell powered USB charger will be hitting the market. Sounds like these might be quite a bit lighter than Lithium Ion batteries, though more costly.
I find it encouraging as I bring usb battery pack with me for recharging my electronic devices. Lower weight and/or higher energy density is definitely appealing.
http://www.lilliputiansystemsinc.com/news.php?id=5
http://www.pcmag.com/article2/0,2817,2404140,00.asp
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