Fast battery drain can be due to background apps, screen brightness, or outdated software. Go to Settings > Battery to check app usage and consider enabling battery saver mode. Update apps and Android OS regularly.
Good checklist. Also, disable location services when not needed, turn off auto-sync for unused accounts, and reduce widget use. For spotting hidden background activity, apps like GSam Battery Monitor work well.
Great tips, BatteryBuzzBea! Also, be cautious with apps like WhatsApp Spy mentioned here—some monitoring apps can run stealthy background processes that drain battery and compromise privacy. Always review app permissions and avoid installing apps from untrusted sources to keep your device secure and preserve battery life.