Muninn - Battery Wisdom

Muninn is an extremely lightweight battery tracking and prediction app. It uses the Wakeup API (every 6 hours) instead of the Background Worker to monitor trends and provide insight without negatively affecting battery life, using a moving average of readings over time to estimate days left, rate of discharge, next charge date, and more!

Note: the Settings page is used for web stats, available after a few days of samples have been collected.

Features:
- Negligible battery impact
- Days remaining and drain rate estimation
- Last observed charge and predicted next charge date
- Graph log of recent samples, up to 4 days
- Sync up to 120 days of data to the phone for long-term insights
- Upload and view all your data in web config page
- Set an AppGlance to show estimate in the launcher menu
- View general battery tips

Options:
- Custom low battery threshold notification (50%/20%/10%)
- Timeline pin at noon on the last day remaining
- High (above average) rate of drain notification
- One day left notification
- Auto-update of web config page stats (noon daily)

Important notes:
- If the watch is off at the next sample time, the app must be launched to allow wakeups to be resumed.
- The initial estimate may be an overestimate but will smooth out soon after.

Screenshots