Can I get my Apple Watch series 2 repaired at the Apple store if the battery swelled up?
What do I do if my Apple Watch battery swelled up?
Apple Watch
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In addition to the Genius Bar for hardware repairs, you have more immediate support options. Get your questions answered by an expert via phone, chat, email, or even Twitter. From setting up your device to recovering your Apple ID to replacing the screen, Apple Support has you covered. Either way, see:
Genius Bar Reservation and Apple Support Options - Apple
For service & repair:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support