Rechargeable batteries that simply flip their lid and plug into a USB port, are starting to make themselves known. They are still too expensive to be a real option for me though, especially since there are already battery chargers that trickle charge 4 AA batteries off a USB port already. This one was priced at $12 for a pair. If Icould get 4 for that price, I think I would buy a bunch of them.
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