Amazon.com: ASDAWN 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
Identify your Apple Watch - Apple Support
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Amazon.com: THIRDPOLE Battery Replacement for Apple Watch Series 1 42mm A1554 A1579 A1803 for Iwatch 1st Generation Iwatch Series 1 Standard Capacity Battery Include Complete Repair Tools kit : Cell Phones & Accessories