It is best not to, first say mobile phone battery, mobile phone battery charge and discharge times are limited. Charging while using is equivalent to multiple charges and discharges. This will reduce battery life, for lithium batteries, the impact is slightly smaller, but there should be about one tenth.
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Talking about mobile phones, the working voltage of mobile phones is 3.6, and the charging voltage is 4.2. Then the excess voltage is applied by the phone to the components, so that the phone will be hot, reducing the life of the phone.
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When surfing the Internet, the mobile phone battery is discharged when the signal is sent, the charger voltage drop is large, the charger works beyond the standard, and the charger works normally when the signal is not sent. Reduces the life of the charger.
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Therefore, while using the charge is very bad, the impact is great!!
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Damage to the battery can also burn the phone
Grid portable wifi can be used while charging. However, frequent charging and discharging will reduce battery life, for lithium batteries, the impact is slightly smaller, but still some, should be about one tenth.