How do you change battery bulova model C837378?

To change the battery in a Bulova model C837378, first, ensure you have a replacement battery (typically a 371 or 373, but check the specific model). Use a case opener tool to gently pry off the back cover of the watch. Once the back is removed, carefully take out the old battery using tweezers and replace it with the new one, making sure the positive side is facing up. Finally, reattach the back cover securely.