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Amazon.com: HDCKU Battery Replacement Kit for Apple Watch Series 1 with Repair Tool Set A1803 and (1st Generation) A1554 42 mm : Cell Phones & Accessories
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Amazon.com: E-YIIVIIL for Iwatch 1st Generation 42mm A1554 Replacement Battery A1579 246mAh 3.78V 0.93Whr with Adhesive + Tools : Cell Phones & Accessories
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Apple Watch Ultra Will Get Up to 60 Hours of Battery Life With Software Update Later This Year - MacRumors
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