**Solution Idea**
1. **Use an open‑source app** – Free and modifiable.
• Go to **GitHub → michelledevg/BatterySaver** (or any similar repo).
• Clone or download the ZIP.
2. **Build & install**
```
git clone
https://github.com/michelledevg/BatterySaver.git
cd BatterySaver
./gradlew assembleDebug
adb install app/build/outputs/apk/debug/BatterySaver-debug.apk
```
3. **Configure**
* Launch the app, enable “Auto‑mode” and set the threshold you want.
* It will auto‑turn on Wi‑Fi, data, etc., to keep the battery healthy.
**Why this works**
- Open source → you can tweak settings.
- No hidden ads, small footprint.
- Handles background processes, aggressive sleep, and dynamic brightness, giving instant savings.
Give it a try and tweak the `config.xml` if you need deeper customisation.