My MBP (from June 2009) had its battery recently replaced (thanks AC!) due to poor health. I am now sitting with a newish battery that has: 119 cycles and 99% health. I generally charge during day and discharge at night (sitting in bed/couch). No gaming or high intensity operations while on battery. One thing I noticed recently was that since the new battery, I had forgotten that I switched to operating in "Better battery life" [or maybe Apple switched for me?]. Once I switched back to "Higher Performance" yesterday, I have noticed two things: 1) My uMBP body runs hotter... it's warming my hands (makes sense) 2) The battery health percentage given by iStat jumped to 98% (immediately, despite being plugged in). Question: Does "Higher Performance" graphics kill battery health faster since my computer always runs hotter? My understanding of LIBs is that warmer temperature reduces "internal friction" so should be less lossy and hold charge better, which I assumed to mean that it should not worsen health. Any comments are appreciated.