Today's Audience Participation Moment

If I use a 15V 2.0A AC Adapter for my laptop, which officially requires a 15V 3.0A Adapter, and it works fine for a couple years, what sort of damage may I have wrought?

(My laptop battery doesn't play properly anymore, so I suspect that I killed it. Silly me, not paying attention to these things. I totally do NOT get electricity.)