I bought a new Lenovo laptop, but sometimes used the power supply for my old Lenovo laptop. I just found out that the old power supply was the source of a very irritating high frequency sound (sample here). If I use the new power supply provided with my laptop, there is no sound. As it's rather convenient to have two power supplies, i would like to know the following:
Will using this old power supply damage my battery? (or some other parts of the computer? -- even though i can't see how that should happen)
(I have also tried to swap the cords going from the AC socket to the power supply -- it had no effect)
If you want to see the technical data for the two power supplies, see this image (old is left, new is right):