A1578
Battery Type: Li-ion
Voltage: 3.80 V
Capacity: 205mAh
Fix My Apple Quality Verified - High Quality Replacement Part Assurance.
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Compatibility:
- Apple Watch Series 1 38mm A1553 A1802
Instructions:
https://www.ifixit.com/Guide/Apple+Watch+Series+1+Battery+Replacement/113778