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  • 1 V too much is unlikely to damage the laptop, but better do not try it.
    – neverMind9
    Commented Aug 28, 2018 at 10:44
  • Using a charger with too low current rating: If the power supply is unable to keep up with the laptop's demands, the laptop will drain the battery if it has one. If too much power is drawn, the power supply will reduce the output voltage to avoid getting overloaded.
    – neverMind9
    Commented Aug 28, 2018 at 10:46