Improving battery life with restrictions
summary
Android limits background work with Doze/Light Doze, Adaptive Battery four buckets (apps can be deferred up to 24 hours in the rare bucket, alarms up to 2 hours), and App restrictions (no jobs, alarms, FCM, location, or background foreground services — even while charging); Pixel Battery Saver also disables location. Use JobScheduler/WorkManager and high‑priority FCM only for user‑visible interrupts; as of Jan 2019 restricted apps drop messages. Test with adb and monitor excessive wakeups in Android Vitals.
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