System Module Block Diagram; Energy Management; Battery And Charging - Nokia MOBILE TERMINAL Service Manual

RM-356
System Module and User Interface

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)
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