Blackberry 8820 Current Draw

There are many articles which make vague mention of how to decrease power consumption and get longer battery life, but few are backed up by numbers. I hacked up a battery and put a Fluke 189 in the battery path in order to measure the draw for various cases. The results are below. Most measurements are a seven-minute average.

Idle States

Device Off1.01
GSM/EDGE802.11/UMABluetoothCurrent, mA
OffOffOff2.94
ConnectedOffOff5.1
OffConnectedOff8.1
ConnectedConnectedOff8.4
ConnectedSearchingOff16
OffSearchingOff11.3
OffOffSearching5.8
ConnectedConnectedSearching10.5
SearchingOffOffTBD

Calls and Additional Features

CaseCurrent, mA
UMA Call80
GSM Call110
GPS On, No Signal+ 37
GPS Tracking+ 42
Screen Backlight, 10%+ 12
Screen Backlight, 100%+ 120
Keyboard Backlight+ 23

How to Calculate Battery Life

To calculate the longevity of your battery, add up the current from the features you have active. Then take the capacity of the battery - nominally 1400 mAh - and divide by the current in mA. This gives you the runtime in hours. For example, if you were making a call on UMA at 80 mA, and also had full-brightness backlight on at 120 mA, for a total of 200 mA, you could expect 1400/200=7 hours of battery life.

This page most recently modified on: Monday, 07-Jul-2008 10:22:27 EDT

the w3c sucks, but this page is still valid
Copyright 2008 by Terran Melconian. You may mirror this page for personal use. All other rights reserved.
Contact, unfortunately now obfuscated due to ongoing spammer harvesting, is [myfirstname] at consistent.org.