Amazon.com: A1579 Battery Replacement Compatible with Apple Watch Series 1 42mm A1554 A1579 A1803 with Repair Tool Set + Installation Instruction + Back Cover Adhesive : Cell Phones & Accessories
Apple Watch Series 0 Edition (18k Gold, 42 mm) Specs (Watch Edition 42mm, MJ4A2LL/A*, Watch1,2, A1554, 2871*): EveryMac.com