Hello everybody, I have a problem with my Ideapad, an annoying sound (critical low battery sound) wich is double beep loud sound, start happen when I was installing drivers, I installed the ThinkVantage and the Lenovo Power Management Driver, after that my laptop does that annoying sound every 5 seconds, since I power up the laptop every 5 seconds the laptop beeps and freezes, I bought another battery thinking it would fix the problem but nothing! I bought it because when I unplug the battery and use the laptop just with the AC power everything work perfect! Also when the battery goes exactly 20% or lowest the beeps/freezes goes await! Anybody know about this problem? Thank you in advance!