Remove the electrical cord from the base of the shaver.
Press down and slide off the panel on the front of the shaver.
Remove the two nickel-plated batteries. Use these batteries as a guide to purchase new batteries at a hardware store or home repair store. Recycle the old batteries when finished. (Many hardware and home repair stores have battery-recycling stations.)
Put the new batteries inside the shaver and press gently to pop into place.
Place the front panel back on the shaver and plug the electrical cord into the bottom of the shaver. Connect to an electrical outlet to charge.