Is it dangerous to leave my phone connected to a
charger?
Short answer: No.
Long answer: The external power source simply
supplies current to the phone, and the microprocessor inside the phone
supervises the charging process. When the battery is fully charged, the
phone will stop charging its battery even if it continues to be
connected to the charger. (While it remains connected to the charger, it
won't draw power from the battery, however. So it can operate
indefinitely when connected to the charger.)
