Many factors affect the amount of time that a portable computer battery can deliver power before it must be recharged. These factors include the types of applications being run and display brightness. Most companies that sell portable computers report battery life estimates for their portable computers. In addition, industry trade magazines and websites such as PC Magazine and www.zdnet.com provide battery life estimates. These estimates are usually based on well- known battery life benchmarks that attempt to replicate the way that portable computers are used in typical environments. Despite continuous improvements in these benchmarks, the estimated battery life figures they yield can differ from actual battery life experienced by users.

In this white paper, we discuss the top battery-life benchmarks, how they exercise the system, and some of the techniques used to more accurately reflect the typical keystroke patterns (including pauses) of end users.  We also discuss the main factors that impact battery life and provide guidance on how users can extend the battery life of their portable computers.