What are the battery capacity and endurance of Amazfit Band 2?

The battery capacity is 160mAh, and the charging time is about 2.5 hours. Normally, the band can be used for a consecutive 20 days. Notes: Standards for the 20-day endurance: With factory default settings, the band receives and displays 100 notifications per day, vibrates for 5 seconds for each alarm, raises to display 50 times, performs other operations for 3 minutes, manually measures heart rate 5 times, exercises 1 hour per week (enters the running function to detect the real-time heart rate and turn off the heart rate alert), and starts the Amazfit App to synchronize data once a day.