Hardware aspects of power saving
From Ask-leo’s article on maximizing Battery life, Leo brings out some interesting points along with Jerry Foutz of SMPS Technology. His article states that the single most important aspect to maximizing battery life is matching the battery to its charger. About the only way you can maximize the probability of this happening is to buy both from the computer manufacturer for the exact computer model. Apparently even small differences in output voltage of the charger can have dramatic impact on the lifespan of your battery, by either under, or over-charging.
Again, from Leo’s article, another factor in battery life? Temperature. If you look at the bottom of your laptop you’ll see it probably has feet (or more likely, bumps or rubber pads) that lift it off of any flat surface you might put it on. That creates very important space for ventilation. If you block that space, with say your lap, it’s likely that you’ll be causing the laptop to run hotter than it should. If you do this regularly, you’ll likely shorten the lifespan of the laptop’s batteries.
Myth or Fact: Running a Laptop 24/7 would reduce my battery’s life.