Old Habit Dies Hard

I just realized, from Suksit's Always Plugged In? blog entry, that keeping the laptop plugged in all the time can shorten its battery life. I normally plug my laptop in whenever AC power is available. One reason is I'm using an older model of laptop which can supply only about 1:30 hours of power through battery, and I'm just too lazy to plug my adapter in and out every hour or so. Anyway, I guess I have to change that a bit.