Excessive battery usage is the percentage of watch face sessions where battery usage exceeds 4.44% per hour. Google Play collects this data when devices aren't charging and no apps are in use.
When battery usage exceeds 4.44% per hour the watch won't last a full day on a single charge. This harms users and the Wear OS ecosystem.
To maximize battery life, aim for battery usage under 3.2% per hour.
Efficiency requirements
An efficient watch face app should have:
- < 1% excessive battery usage
- < 3.2% battery usage per hour for 80% of sessions
Vitals provides the following data:
- Excessive battery usage over time
- Battery usage per hour histogram
- Contributing factors
- Breakdowns
Contributing factors
These are key factors affecting your app's battery usage:
- Excessive CPU usage: The portion of watch face sessions that use the CPU for 90 seconds or more per hour.
- Excessive partial wakelocks: The portion of watch face sessions use wakelocks for 18.5 seconds or more per hour.
Use breakdowns and Battery Historian to investigate further.
Breakdowns
Breakdowns group affected sessions by characteristics such as OS, device, and region. Select a breakdown to see an hourly battery usage histogram for that group.