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This circuit shows a dual battery load sharing application with automatic switchover of power between the batteries and a wall adapter. In this example, the battery with the higher voltage supplies all of the power until it has discharged to the voltage of the other battery. Once both batteries have the same voltage, they share the load with the battery with the higher capacity providing proportionally higher current to the load. In this way, the batteries discharge at a relatively equal rate, maximizing battery run time.