Hi, name is Chris. I have an issue with my MACBook. What happens is I charge the battery fully to 100%. unplug it and shut it down for the night. I am at 100% when I shut it down and I know it is NOT IN SLEEP MODE. The following day, I turn it on and it is at 50%, later that day, it is either at a very low precent or 0%. I took it to the Genius Bar, and they replaced the battery and I bought a brand new charger. I am not new to computers, I'm more of a PC guy, but I know there is something wrong my my PC laptop is outlasting my MAC. Just to be clear, and let you know, I have a 2009 version of the MACBook pro, 15 inch. running snow leopard with the latest version of 10.6.8, 2.66GHz, Intel Core 2 Duo and I just recently wiped the HDD and reinstalled the OS with no additional apps installed. Any one have any ideas? P.S. as of writing this post, I lost 10% charge on the battery.