[jyl]

Every battery will last for only so many charge cycles. So if you have access to wall power, use it. Don't unnecessarily use up a charge cycle.

That's about it. Li-Ion are not supposed to have much memory effect so don't worry about it. And modern notebooks use smart charging, they sense the charge state of the battery and won't overcharge.

If you will use the laptop unplugged a lot, switch to a low-power setting in your power management. One should already be set up. Low screen brightness, idle drives, etc. That will extend your hours per charge. I get 5-6 hours from my notebook battery.

Another trick is to carry a 2-to-1 power cord or adapter. So in an airport or meeting room, if the outlet you want is being used by someone else, you can both share it.