I
PAQ H3800
AND
H3900 S
ERIES
P
OCKET
PC B
ATTERY
Document No. 308402-001
1
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
October 2002
Prepared By
Product Marketing
iPAQ Mobile
Solutions
HP/Compaq
Computer
Corporation
iPAQ H3800 and H3900 Series Pocket PC Battery
White Paper
Topics include:
•
iPAQ Pocket PC Battery Terminology
•
Battery Design
•
Battery Usage
•
Power Management on Devices
•
General Usage Tables
•
Accessories
•
Frequently AskedQuestions
Executive Summary
Abstract: This Battery White Paper is designed to inform customers about the battery
technology usedin the iPAQ Pocket PC H3800 andH3900 Series.
This document provides information on how to best configure the iPAQ Pocket PC H3800
andH3900 Series to optimize run time, how various accessories use battery power, and
how to charge your Pocket PC.
iPAQ Pocket PC Battery Terminology
Backlight
– Also called Front Light. This is a Cold Cathode Fluorescent Lamp (CCFL)
used to light the display. The backlight is one of the highest consumers of battery
power. The brighter the light,the more power is consumed.
Backup Battery
– The iPAQ Pocket PC does not contain a separate backup battery. A
portion of the internal main battery is reserved for back-up purposes. When the Pocket
PC is running on the back-up portion of the main battery,it is in Battery Reserve.
Battery Capacity
– The amount of available battery storage. As lithium ion batteries
get older,with use,they lose capacity. The battery is designed to retain a minimum of
80% of its original capacity after 300 complete discharge and charge cycles.
Battery Disconnect
– This is the state where the battery is prevented from supplying
power to the Pocket PC. Pressing the power button will not turn on the device. The
Pocket PC ships from the factory in this mode. Connecting the Pocket PC to AC power or
pressing the reset switch will activate a battery that has been placed in battery
disconnect mode. A Full Reset is accomplished by placing the Pocket PC in this mode,
then re-activating the battery. To prevent over-discharge to the battery,the Pocket PC
will protect the battery by entering battery disconnect mode when the battery reserve
has been depleted.
