So question is about batery capacity during life in Garmin Edge Explore.
My explore is already 3 years old and now the battery dies fast. Even though just recording, it’s 12% an hour. Recently I disassembled my explore and found the battery model to be 361-00035-15. Available on Amazon and eBay. The replacement procedure is just like a phone. Just bring it to a phone repair place and get the job done.