will not
At present, smart phones use lithium batteries, when the mobile phone battery is full, it will automatically cut off the charging power to avoid overload overcharge, so there is no need to worry about causing damage to the mobile phone battery.
Of course, it should be noted here that the mobile phone charger used must be a regular charger, preferably the original charger. Some copycats or models do not match the charger, it is best not to be used to charge the phone at night, to prevent the poor quality of the charger, resulting in the charger burned, hurt the phone.
Will not millet mobile phone charging circuit protection device, when the mobile phone detects that the charging power is 100% automatically limit the charging current to a small micro current, as long as it is not playing while charging, from you sleep to wake up full of minimal impact on the battery, and now lithium-ion battery protection is very good, so in summary, millet mobile phone charging a night can not charge bad battery
No, today's mobile phones can automatically power off after a full charge.