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When you are using your iPhone, especially during charging, playing with your phone will cause the battery to drain faster. That's because while charging, the iPhone is using its battery to charge and run apps at the same time.
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If you are using high consumption applications, such as games or video players, the battery will drain faster. In addition, using a bright screen for a long time and enabling wireless networks (Wi-Fi or cellular data) can also negatively affect battery life. It is recommended to minimize the use of the phone while charging to extend the battery life.