Respironics, 12volt DC Battery Adapter Cable with Battery Clips
http://www.cpap.com/productpage/respironics-12volt-dc-battery-adapter-cable.html
"This adapter fits over the cigarette lighter plug on the DC power cords and ends in alligator clips in order to connect a CPAP directly to a battery. A DC power cord is needed in order to use this adapter.
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DS Lite Battery Upgrade 1200 mAH - HKToyz.com - Import games, consoles & accessories
http://www.hktoyz.com/component/page,shop.product_details/category_id,4/flypage,shop.flypage/product_id,21/option,com_virtuemart/Itemid,1
"The original battery from Nintendo is 1000 mAh, so you will gain up to 3 hours of extra battery life with this one!"