Ok so my battery went dead within a few months of replacement for the 2nd time. The battery that came with my macbook pro went dead after few short months of use and Apple gave me a replacement. The replacement didn't last long either as it also went almost completely dead in under 130 cycles. I called Apple again and they told me that there might be something wrong with the laptop itself because the chances of getting two bad batteries were not very big and to take it to an Apple store. I did. The so-called Mac "genius" there just gave me another replacement battery...... I stood there and argued with him for 5 minutes that it might be possible that there might be something wrong with the computer hardware instead of the battery but he wouldn't listen to me. All he did was to go in the system profiler, look at the battery mAh and cycle count and give me a new battery based on that data and remarks that "after checking my laptop thoroughly" it seems to be working properly... Has this ever happened to anyone before? I am in a dilemma because I want to upgrade my 120gb hard drive to 320gb but I know that voids my warranty and if this 3rd battery also craps out on me Apple will deny all coverage. Any feedback is greatly appreciated. Is it possible that I really got two bad batteries or is there something wrong with my macbook pro? Should I go ahead and put the new hard drive in? I have a 2nd gen 2.33g macbook pro. Right now I'm running on battery power at full brightness while listening to music and browsing the web and I'm losing 10% battery in approximately 15 minutes. So estimating roughly it will last about 2.5 hours. Is this normal for a brand new battery?