How do i replace my apple watch battery

Go to this page to find out more about the Watch repair service.: Apple Watch Service & Repair - Apple Support

Once you're on the page I directed you to, for cost estimates go to the "Get an Estimate" menu, select the service type, then your series model, then the specific sub-model you have.

Hello ~ Any help here by clicking on below?

Apple Watch Service & Repair - Apple Support

~Katana-San~