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. For information on treatment, call 202-625-3333 collect.