I downloaded the CoreDueTemp App and find my temperature is around 150 - 162ºF. The Information on the Apple Batteries page says "Your Apple notebook works best from 50° to 95°F". Is this relevant for the MacBooks? Do I have a very hot computer... or is this normal? By the way - I have 3 applications open - Dashboard, Mail and Safari. The computer is in "Better Battery Life" mode. Currently I can only get 1 - 1:30 of battery life - although it used to manage 3-4 hours comfortably. If it is very hot and the fans are running all the time - will this be having an adverse affect on my battery life too? The room I'm in it's about 18ºc (64ºF) - maybe a bit less.