Using a wrong charger on my laptop.

Hi @hermannatangue

There are a lot of variables as to what exactly could happen, as it depends on how much extra voltage was applied, what over-voltage protection circuits were designed into the laptop etc., so it is a hard to give a definitive answer as to what the exact amount of damage would be.

If the laptop was turned off and you connected the incorrect charger which had a higher voltage output than is specified for the laptop, then most likely the power input components on the laptop motherboard would be damaged, which would mean that you couldn't power the laptop with a charger anymore until it was fixed. It could also make it that you couldn't turn the laptop on at all, even when using the battery only.

If the laptop was already turned on when the incorrect charger was connected then there would be more damage to the motherboard as more components would be affected by the higher voltage, damaging them as well.

Basically, never connect a charger which has a higher voltage output than what is specified to any electronic/electrical device as you will damage it. You may be lucky that the damage may be minimal, but there's no guarantee that it will be.