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The ring cap is the input capacitor. In a buck charger, instead of the motor, you have an inductor hooked to m+, and battery bank to be charged hooked to inductor's lead B. Output cap to inductor lead B as well. Output cap Neg to neg of Battery bank being charged. It makes an LC filter so the voltage and current are more stable.
Oh ya, you also need a rectifier before the ring cap if you are charging with AC.
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