Basically it means you can use your rechargeable AAs as a mobile phone power bank and have the same device charge the batteries after depletion = no need to carry separate charger. After much Googling I only found the Tekkeon MP1580 (from the Strobist blog) can do this. But shipping from US costs more than the product itself. Surely for something so useful and ingenius there must be more than one choice?
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