The battery life of the iwatch 6 is officially marked with a maximum standby of 18h, 1.5 hours of charging, battery capacity is 303mAh, and wireless charging is supported. However, after testing, the battery standby time can exceed 18 hours or more. In the case of full WiFi and all-day heart rate detection, after about 50 minutes of exercise, the battery still shows 19% remaining, at this time Apple watch s6 has been running for 23 hours.
The Apple Watch goes from zero to full charge in about 2.5 hours. Apple has made sweeping claims that the Apple Watch can last up to 18 hours on a single charge. But heavy use only lasts about five hours