I just put in a brand new battery for my 15" Mac Book Pro. I calibrated the battery once already and get about 3-5 hours of battery life depending on usage. OS system profile, coconut battery and istat all show me that the health of the battery is at 50% which was what the old battery had. Is there any way to get these programs to show the proper battery life? I know it is working because I do get a lot more battery life then I did with my old battery.