IPhone Series 2 Battery Defective
Apple Watch Battery swelling in stainless steel 38mm Series 2. Heard Apple has recall on these defective batteries. How do I get my watch fixed?
Apple Watch
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For repair & service:
watch Repair - Official Apple Support
watch Service Pricing - Apple Support
I really doubt the series 2 watch is still under any kind of warranty. But you can check with this link
Apple Service Programs - Apple Support