[mentalpiracy]

This honestly sounds like the electricity service line into your place is fucked slightly and it is gradually destroying your electronics.

[Tade0]

And/or a particularly hot climate. Some environmental effect either way.

[Dylan16807]

To damage batteries it would have to get through two separate power converters. I'm skeptical of that.

[Abishek_Muthian]

I regularly check the electrical outlets and the main supply; it's mostly just my bad luck.