System module block diagram
Energy management
Battery and charging
BL-5J battery
The phone is powered by a 3-pole BL-5J S-pack 1320 mAh battery. The three poles are named VBAT, BSI and
GND where the BSI line is used to recognize the battery capacity. This is done by means of an internal battery
pull down resistor.
Figure 52 Battery pin order
The battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line.
This is located on the main PWB, at the place where the phone temperature is closest to the battery
temperature.
Battery connector
The battery connector is a blade connector. It has three blades;
•
BSI (Battery size indicator)
RM-356
System Module and User Interface
Page 6 –8
COMPANY CONFIDENTIAL
Issue 1
Copyright © 2008 Nokia. All rights reserved.
