For PitPat 2, you’ll need a CR2032 coin cell battery like the ones very commonly used in car remotes. You can get one in many supermarkets, other stores, online or in our shop. To change the battery, just take your PitPat off your dog’s collar, slide out the Velcro and give the battery-cover a quarter turn anticlockwise. Take out the old battery, put in the new one (+ side up), and replace the battery-cover securely.