When the Pro Key is installed alongside the base app, it provides access to: Ad-Removal

: Often, the Pro Key will not show up in your app drawer or will have a "hidden" icon, as it is strictly a license for the primary application. found in your device settings? 3C Battery Manager Pro key - APK Download for Android

3C Battery Manager Pro Key is a premium license that unlocks advanced features within the free version of the 3C Battery Manager app

: Once you install the Pro Key APK, the main app will automatically detect it and switch to the "Pro" version.