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 Off | 1.01
|
| GSM/EDGE | 802.11/UMA | Bluetooth | Current, mA
|
|---|
| Off | Off | Off | 2.94
|
| Connected | Off | Off | 5.1
|
| Off | Connected | Off | 8.1
|
| Connected | Connected | Off | 8.4
|
| Connected | Searching | Off | 16
|
| Off | Searching | Off | 11.3
|
| Off | Off | Searching | 5.8
|
| Connected | Connected | Searching | 10.5
|
| Searching | Off | Off | TBD
|
Calls and Additional Features
| Case | Current, mA
|
|---|
| UMA Call | 80
|
| GSM Call | 110
|
| 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.