Apps running in the background are the likely cause

When drain happens while the phone sits unused, background apps and syncing are the usual reason.

Mail, social, location, and backup apps can wake the phone many times an hour.

Try this now

1. Open Battery usage and note apps you did not open.
2. Put one or two of them to sleep, or set them to Restricted.
3. Try one night in Airplane mode as a test to see how much changes.

Step-by-step guides for this

• Why does my Android battery drain overnight?
• How do I fix Android battery drain?
• How do I disable apps that came with my Android phone?

Other possible causes

• Your phone is probably limiting the charge on purpose
• Heat is the likely reason your battery drains
• A new app or update is likely using extra power
• Your battery may be wearing out
• Weak signal is likely draining your battery
• Your screen and daily use are the main drain

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