Battery life was never great with my early 2008 Penryn Macbook Pro 2.5 15". I never reached the advertised time, promoted by Apple or mentioned by other users. normally, the battery lasted for 2 1/2 hours before shutting down with energy all saving methods enabled. After the Snow Leopard update, my battery shows "Service Battery?, when clicking on the battery symbol and the MBP reaches not more then 1/2 hour of battery life I am stumped. I use the MBP professionally and will head out for a new spare battery now. I have Apple Care and hope, Apple manages a proper solution for this. What is your experience with this issue?