Most HP iPAQs have a built-in feature called "USB Charging," which enables the ability to charge your device from your PC's USB port and allows you to set the rate of charge to "Slow" or "Fast." To activate this feature, go to Start >Settings >System tab, tap on the Power icon, and select the tab labeled "USB Charging." Check the box labeled "Use USB Charging" if you want your iPAQ to charge while it is connected to a desktop PC via a USB sync cable. Once the box is checked, you can then select from one of two charging options:

• Slow Charge: This option charges your device at a lower power setting over a longer time period. Use it when don't need to recharge your device quickly, especially for overnight charging. Because this setting provides less power, you should not use it if you intend on using your device while it is being charged. Also, be sure to turn off the screen if you choose this setting.
• Fast Charge: This is the default option when you activate USB Charging. It provides more power and charges your device faster. Note that this setting will cause your battery to heat up more than the Slow Charge setting, which may cause a reduction in the life of the battery over a period of time.  Use the Fast Charge setting if you intend on using your device while it is charging.