You should remove the battery in your power razor when vibration slows or ceases. Don’t leave a depleted battery in your device. Always replace batteries in a dry environment, and dispose of batteries in accordance with local regulations. Insert an alkaline battery correctly and do not short circuit. If your battery leaks, wipe the razor clean with a damp cloth, and wash your hands. If any material gets into your eyes, contact a doctor immediately. Keep batteries away from children. If swallowed, consult a physician at once.