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[mario888]

check this out: dragon 3600mah thunder power pack for psp/gameboy/nds.  it says it can "Quick charge and supply power for over 16 hours with Nintendo DS" its about 15USD. this is the highest capactiy battery extender/charger i've researched so far. heres the link http://www.rocksoftonline.com/component/page,shop.product_details/flypage,shop.flypage/product_id,172/category_id,20/option,com_virtuemart/Itemid,26/