if you always leave the AC in it'll slowly kill the battery and it won't get a full charge anymore...kinda like what mine did. Make sure you get a vent system for the laptop. It'll make the battery last easily a year longer.
Leaving it on the charger will not kill the battery... They just slowly die overtime.
I like Psaila use my laptop like a desktop and have wondered about the battery, my question is, Can you run a laptop from the mains without the battery installed? I've looked in my docs for my HP Pavillion but can't see any info on this. Thanks
Ivan