I have a MBP that's about a year old. My battery was working fine and still giving me about 2.5 hours on a charge. Recently I noticed significantly less battery time (about 1:15) per charge. I calibrated the battery and had full charges on it but still would not get more than 1:15 reading on the battery meter for a full charge. Today, I turned off my airport and plugged into a network cable to test my slingbox. I noticed my battery meter read 2:45. It hasn't done that in about 2 weeks, and I just bought a new wireless n router 2 weeks ago. I was shocked so I started testing. When I turned the airport on and connected to my wireless g router, the battery time dropped down to 1:50. When I connected to my wireless n router the battery meter dropped to about 1:40. It seems like using the wireless over the network plug takes significantly more battery time. Interestingly, ever since I plugged into the network cable my battery meter seems to have been reset. I'm now getting at least 1:40 on a full charge when previously I was consistenly getting 1:15 of battery time on a full charge. Any explanations?