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Hi,If you want something off the shelf, you might want to look at: http://redoakcanyon.com/power-controller-hat-with-... , a fully compliant HAT power controller with a built-in a/d, or this, http://redoakcanyon.com/intelligent-power-controll...just the controller (not a HAT). Both are intelligent on/off controllers, have a battery level monitor that tells the % battery power remaining and to initiate safe shutdown/power off when the battery is low, and come with a 2000 mAh battery. You just add your switch.
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