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Make a portable power brick with plenty of juice! Use Alkaline AA's for a 9V 3000-4000mAh power supply, or rechargeable NiMH for 2000mAh 7.5V supply. Either one is good for running electronics that have a 5V voltage regulator (thus requiring a 7V+ supply). Will last about 10 times longer than a 9V
Perfect for portable Arduinos! Batteries not included
As of October 1, 2016 this now has a slightly different shape and has the 2.1mm DC jack pre-attached!