Easiest way to convert a mechanical pendulum clock to battery

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FORM AND FUNCTION – Stay on schedule with your Scandinavian inspired pendulum wall clock from Driini. Your unique swinging clock makes itself at home

Driini Modern Pendulum Wall Clock - Decorative and Unique Metal Frame, with 8 Inch Face - Contemporary, Minimalist Design, with Silent Battery

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Mechanical Clockwork Clocks Converted to Battery Movement