Energy Management; Battery And Charging - Nokia RM-645 Service Manual

RM-645
System Module
Board and module connections

Energy management

Battery and charging

BL-5CT battery
The phone is powered by a 3-pole BL-5CT 1050 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 34 Battery pin order
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