Clamshell destroyed my battery!!!

[6mt15]

So about two weeks ago, I bought a wireless keyboard and mouse for my macbook, and started using it in clamshell mode with my external monitor. I left it that way for the last two weeks. I finally pulled my macbook off of my keyboard tray (I had kept it down there to keep cable clutter to a minimum) and took it to work yesterday, and to my dismay, the battery life was only an 1:15!! I have consistently gotten 4 hours out of it for the last 10 months, an iStat Pro still tells me the battery health is 96%.
Anyone know what could have happend? Heard of this before? Any info would help!

 

[DeaconGraves]

1. Try calibrating the battery.

2. Did you previously had bluetooh on before? If not, turn that sucker off. Biggest battery drainer of them all.

 

[TEG]

Run it down and recharge it. If you are at 96% you should get 3:40+. Make sure "Best Performance" isn't checked but that "Better Battery Life" is selected.

TEG

 

[6mt15]

I've already calibrated once, and am in the process of calibrating again. I've always left bluetooth on (I use a bluetooth mouse even when I'm out an about), but even when its off, there is no improvement. "Better battery life" doesn't seem to help either. I just unplugged it 3 minutes ago, and I've already dropped from 100% battery to 95% battery. Is my batter toast? Would my AppleCare cover this?

 

[kage207]

All the new Macs have this way of charging the battery to protect battery life. I forget what it is called but charges it to 100% and then it lets it drop to 95% before recharging it again. Though I'm not sure what could have happened. Your AppleCare protection plan might cover it.