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battery polarity protection circuit

Dear sir,

we are using 15 v battery.we are wish to add battery polarity protection circuit..

is there any simple circuit for this

1.if we give 15v zener diode across is it enough?

it will working below or above 15v if i reverse battery polarity it forward biases and current not goes

it will working is it.

2. if it add serial shottkey diode to the battery but the current always go through diode and voltage drop across diode

           please tell me which is the best method for this.Thank you

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