Android battery & charging

Battery optimization killing Android apps in the background

Aggressive battery optimization, especially on some manufacturer skins, can stop apps like messaging or alarms from working reliably in the background. Whitelisting specific apps balances battery life with functionality.

Difficulty
Easy
Time
10–15 minutes

Symptoms

  • Notifications from certain apps arrive late or not at all
  • Alarms or reminders fail to go off on time
  • Music or navigation apps stop unexpectedly when the screen is off
  • An app works fine when open but fails silently in the background

Likely causes

  • CommonThe app is set to 'Optimized' or 'Restricted' battery usageAggressive optimization can suspend the app's background processes, including notifications and alarms.
  • CommonManufacturer-specific battery management features being overly aggressiveSome phone brands are known for particularly strict background app killing beyond stock Android behavior.
  • PossibleThe app itself isn't requesting the right permissions to stay active, like exemption from Doze modeApps handling alarms or calls need specific permissions to survive background restrictions.
  • PossibleLow storage or RAM causing the system to kill background apps more aggressivelyA phone low on available memory closes background apps sooner to free resources.

What to do

  1. Go to Settings > Apps > [app] > Battery and change its setting from 'Optimized' or 'Restricted' to 'Unrestricted' for apps that need reliable background operation.
  2. Check your phone manufacturer's battery management settings for an additional 'protected apps' or 'auto-start' list and add the app there if available.
  3. Make sure the app has notification and alarm-related permissions enabled in its app settings.
  4. Free up storage space if the phone is nearly full, since this can worsen background app killing.
  5. Restart the phone after making changes to ensure the new settings take effect.
  6. Test the app's background behavior over the next day, like checking if notifications and alarms arrive on time.
  7. Only unrestrict apps you actually trust and need in the background, since it does use more battery.
  8. Check for an app update if the issue is specific to one app and persists despite correct settings.

When to call a pro

This is a settings adjustment and doesn't need professional repair.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.