This is covered under Applecare only base on the info from Apple website.
Battery service - Singapore
If your battery has a manufacturing issue that's covered by the Apple Limited Warranty, AppleCare+, or consumer law, we'll service your Apple Watch at no additional cost. Our warranty doesn’t cover batteries that wear down from normal use. We offer out-of-warranty battery service for a fee.
If your Apple Watch battery holds less than 80 percent of its original battery capacity and it’s covered by AppleCare+, you will get Apple Watch battery service for no additional charge. We might need to test your product to find the cause of your battery issue.
These prices are for service directly from Apple. Pricing and terms vary at other service providers.
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