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Hello there!
iPhone 4s is widely used in Vietnam and, like its predecessors, may encounter various issues such as overheating, battery swelling, power issues, camera problems, and more. We've received similar questions before, like iPhone 5 showing a virtual battery and screen unresponsiveness.
There are various reasons for the iPhone 4s virtual battery warning, especially during long trips, extended workdays, vacations, or summer events. First, check the battery health to diagnose the wear percentage. If it's around 80%, consider replacing it.
Next, inspect the charging cable, power source, charging duration, background apps, conflicting apps, and power-consuming apps. If identified, control or remove them and monitor any subsequent changes.
Finally, utilize battery management apps to determine and estimate the current battery usage for activities such as calling, listening to music, watching videos, browsing the web, etc. Compare the estimated hours with your real-life usage. If your iPhone is Jailbroken, consider using the BatteryLife tweak from Cydia to fix iPhone virtual battery issues. Wishing you successful troubleshooting!
