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How To Check Your Android Phone's Battery Health
By FAISAL RASOOL
The lithium-ion battery inside your Android phone has a limited life span, but you can monitor the degradation to keep your phone’s battery healthier for longer. Or, if your Android phone has a poor battery life, it's always a good troubleshooting step to check the phone's battery health. Android (by default) doesn't have such checks built into it, though, so follow these steps.
Open the dialler app and punch in the following code: *#*#4636#*#*; as soon as you tap the * key, the Android Testing menu should pop up. If you see Battery Information in the menu, tap it to view the health status of your battery. For many phones, dialing the code might not return anything, so in that case, you'll need to move on to the next method.
Try a third-party app like Battery Guru, which generates detailed charging-discharging stats and reports the battery capacity based on daily usage. It runs in the background, monitors battery usage to estimate the battery condition, and recommends you keep the charge between 20% and 80%. In general, you should avoid charging your Android phone to 100%.