Hi. Just for the last three to five charges of my battery, I realised that the entire system will hit a major slowdown (super super laggy) for a minute and then turn itself off. These happens between battery charges of 5% to 7%. Whenever I plug in the cable and bootup, system shows 5% to 7% battery charge left. By right, the major slowdown and turning off only happens when it is near 1% or at 0% from what I knew, previously. I am not entirely sure, but I was suspect 10.7.4 to be the cause (I might be wrong), or maybe it is my battery (500 cycles @ 90%). Battery condition registers at 'Normal'. Anybody faces the same issue? I might do a reinstall on system or change my battery to try rectify this problem.. Thanks in Advance.