Power Management

The primary function of power management is to increase the battery life of an H/PC. Power management is accomplished by providing accurate estimates of remaining battery life and notifying a user when batteries are nearly depleted. Power management for an H/PC is based on the following assumptions:

• The H/PC is used less than two hours per day in bursts from five minutes to one hour.
• The display is powered 100 percent of the time during use.
• The device runs less than 10 percent of the time during typical use.
• The device uses both main batteries and a backup battery.
• The device has no nonvolatile, writable memory.
• PC Cards and other storage devices that draw appreciable power from internal batteries significantly reduce battery life. To obtain maximum battery life, avoid using PC Cards in favor of storage devices that draw little power.