The Apple Watch Series 3 was announced in 2017, September With 1.65 inches Retina OLED, 1000 nits (peak), Powered by Apple S3 and running watchOS 4.0, upgradable to 8.7, the device delivered smooth performance and multitasking capabilities. while the Li-Ion 341 mAh (1.34 Wh), non-removable ensured long-lasting usage.