As I take my ThinkPad with quasi daily to the university, I ordered this power supply, making it one of the two power supplies can remain in the backpack and I do not forget to take it. This power supply was until now the one that has remained at home, it was so rarely used. It has now held about half a year. It was then when I pocketed it suddenly dark in the apartment - the security was there. I had first suspected a spark in the socket, but since the power supply does no longer make a sound. It is also much lighter than the power supply that came with my laptop (also the model with 90 watts). It will be apparent power supplies from different manufacturers Lenovo sold, mine was crap.
