New 2011 Macbook pro I5 overheating battery issues

I have a macbook pro 2011 model that was purchased from my UC campus store a month ago. I've barley even used it, but recently the macbook has been having issues. The macbook only reports 3hours max of use on a full charge. Showed 10 to 11hours the first 2 weeks. The macbook's fan never came on before, now its on and stays on. I downloaded Istat and at idle the cpu is 77C and when using it on full power it reaches 100C or more when watching a movie ect..

I bought two macbooks at the same time. The other one still seems to report 6-7 hours battery life not the 10-11 reported once new. The other one also seems to be getting a little hotter than it should be. They both recently had a firmware update that apple downloaded and made appear on my screen saying to update. The issues on one macbook are pretty bad. The other seems like its heading the same direction. The wierd thing is the macbook pro that is doing ok was used alot more by my girlfriend and my macbook pro has been used less, yet has more issues.

Is this a firmware update issue or is this something I should worry about and take my computers into the macstore to be checked out?