Ok, maybe someone has already mentioned this, and if so, please redirect me.

I'm wondering, I run my Powerbook all the time hooked up to its ac adapter. Slowly but surely, my battery starts showing lower percents while it's hooked up. Then, I know that to optimize your battery life, one should drain and charge, and drain and charge. What's the best way to have your laptop setup "power-wise", if you rarely disconnect it from the wall? Any settings I should know, and is there a way to just "turn off" your battery, so it doesn't age as quickly on me?