The watch uses a size 1632 and the strap uses a different size but I can't remember the number. I got the battery at my local ACE Hardware but you can purchase both sizes at any big box like Target or Wal-Mart
My hubby changed mine out...just popped off the back and gave me the old one so I could take it to the store and get the same thing. It's one of those flat camera-type batteries. I had him change out the one in the sensor at the same time. As Unident said, any watch or jewelry store would be able to do it too.
SparkPeople, SparkCoach, SparkPages, SparkPoints, SparkDiet, SparkAmerica, SparkRecipes, DailySpark, and other marks are trademarks of SparkPeople, Inc. All Rights Reserved. No portion of this website can be used without the permission of SparkPeople or its authorized affiliates.
SPARKPEOPLE is a registered trademark of SparkPeople, Inc. in the United States, European Union, Canada, and Australia. All rights reserved.