Go to Settings > Accounts & Sync and disable "Background data." Brightness: Keep it below 30% manually. Conclusion
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Even on old phones, be wary of apps asking for too many permissions. A battery saver shouldn't need access to your contacts or SMS. Pro-Tips for Gingerbread Battery Life Go to Settings > Accounts & Sync and
Because the official Google Play Store may no longer support your version of Android, you might need to sideload an APK. Pro-Tips for Gingerbread Battery Life Because the official
Avoid "Live Wallpapers"—they are major CPU drains on older hardware.
While Greenify is still around, its early versions were famous for working on rooted Gingerbread devices. It "hibernates" apps rather than just killing them, preventing them from restarting themselves and draining your juice. 3. Advanced Task Killer