A phone that went from a full day to half a day of battery usually has one or two apps to blame, not a bad battery. Android already measures which apps use the most power; you just need to know where to look and what to change. Here is a step-by-step approach.
Step 1: Find the battery-hungry apps
- Open Settings > Battery > Battery usage (on Samsung: Battery and device care > Battery > View details).
- Look at the list of apps since the last full charge.
- Note any app with high background usage, especially one you barely opened.
Screen and phone signal near the top of the list are normal. An unused shopping, social or “cleaner” app near the top is not.
Step 2: Restrict background activity
Open the app’s battery settings and choose Restricted (or Put to sleep / Deep sleeping apps on Samsung). The app can still run when you open it, but cannot wake up the phone in the background. Avoid restricting messaging apps, or you may miss messages.
Step 3: Turn on Adaptive Battery
Settings > Battery > Adaptive preferences > Adaptive Battery. Android learns which apps you use rarely and limits them automatically.
Step 4: Check location and sync
- Remove “Allow all the time” location from apps that do not need it.
- Turn off Wi-Fi scanning and Bluetooth scanning in Location services if you do not need them.
- Reduce auto-sync for accounts you do not use.
Step 5: Adjust the screen
The display is the biggest power user.
- Use dark mode, which saves power on AMOLED screens.
- Lower screen timeout to 30 seconds.
- Use adaptive brightness.
- If your phone has a 90 or 120 Hz screen, choose “Adaptive” instead of always-high refresh rate.
Step 6: Look out for apps that should not be running
An app that drains battery, shows ads outside itself and was installed recently may be adware. Read our guide on spotting malicious apps, and uninstall anything suspicious.
Step 7: Keep apps updated (or roll back)
Battery bugs are often fixed in updates. If drain started right after an update, the new version may be the cause. You can downgrade to an older version until a fix arrives.
Common battery drainers
| App type | Why it drains | Fix |
|---|---|---|
| Social media | Background refresh, video autoplay | Restrict background, turn off autoplay |
| Games | GPU and screen use | Lower graphics, close after playing |
| Navigation | GPS and screen | Use only while driving, download offline maps |
| Streaming | Network and screen | Download on Wi-Fi, lower quality |
| Cleaners / boosters | Constant background tasks, ads | Uninstall |
Battery health habits
- Avoid keeping the phone at 100 percent for hours. Many phones offer a charge limit (80 to 85 percent) or adaptive charging.
- Avoid heat. Do not charge under a pillow or game heavily while charging.
- Use a good-quality charger and cable.
Frequently asked questions
Should I close apps to save battery?
No. Swiping apps away and reopening them uses more power. Restrict only the apps that misbehave.
Do battery saver apps help?
Rarely. Android’s built-in Battery Saver and Adaptive Battery do the job better without ads.
When should I replace the battery?
When the phone shuts down at 20 to 30 percent, or battery health (shown on many phones under Battery settings) is below about 80 percent.
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