Prevent Your Galaxy Phone from Being Overcharged

Although phone batteries can be charged and discharged many times, they will still gradually wear out. If a battery is constantly being overcharged, it might reduce its capacity and lifetime. Keeping a phone connected to a charger (when the phone is already 100% charged) while you are using it may lower battery life if you do it repeatedly.

When enabled, the Protect battery feature limits your phone's battery from being charged above 85% to preserve your battery lifespan in the long run. 

Step 1.  Go to Settings > Battery and device care.

Step 2. Tap on Battery.

Step 3. Scroll down and tap on More battery settings.

Step 4. Turn on the switch for Protect battery.