PC, USB cable, ADB & Fastboot tools installed.

A: An outdated Play Services on KitKat can cause battery drain because it constantly tries to sync with Google’s modern servers. If you notice unusual drain, disable auto-sync for apps you don’t need.

A: Yes. If rooted, you can manually push the APK to /system/priv-app/GoogleServicesFramework/ and set permissions to 644. But this is riskier and not needed for most users.