Hey guys I am trying to see if its possible to use an arduino to switch batteries automatically upon one becoming discharged. There are two batteries that are 4000mAh at 22.2V. With the arduino could one be charging then when then when the other battery dies they switch. Once they switch the one being used is now being charged and the one being charged now becomes the one being used. Thanks for all those who reply this will be a great help.
What kind of consumers will be run from these batteries? If one is always loading why don't you use that power directly and eliminate the batteries?