Tips for extending battery life

What are so tips and configurations I can make on my FreeBSD system to make my battery last longer?
Both as in to make my system last powered on longer while unplugged and to keep the battery healthy as long as possible.

I use a thinkpad t410s with Intel i5 M 580, 8 Gbs of RAM, Sanyo 42T4688 battery (roughly lasts 2:30 hours with current set up), Intel core processor intergrated graphics controller and Intel Centrino wifi card as my primary network connector.
With XFCE as my desktop manager.
 
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