Well the revolt's hardware is almost capable of being a battery charger. You will need to add voltage measuring inorder to be a real charger. Also, you will need to modify the firmware to ro read the voltage.
Currently the revolt is basically a constant current power supply. The duty cycle is always changing to maintain a steady current output.
You are correct about the duty cycle output. 50% duty would be 50% input voltage coming out.
Yes, As the voltage gets closer to the cells voltage, less current will flow.
-Adam
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