Why is my pendulum stopping?

The reason a clock pendulum often stops swinging, after being moved, is because the clock case now leans at a slightly different angle then it did at its former location. A clock is "in beat" when the tick and the tock are evenly spaced.

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Subsequently, do pendulum clocks need batteries?

Little did I know back then, but pendulum clocks don't need batteries at all! It may seem like it's just idling around, serving no real purpose as it swings to and fro, but that action is actually what keeps the clock accurate to the second. How often should I wind my pendulum clock? Winding ? One Day clock. Wind the clock once each day, preferably at about the same time each day. Turn the key with a smooth motion, stopping when the spring will not wind any further. Never let the key snap back in your hand, always release it gently after each half turn.