Energy Management; Battery And Charging - Nokia RM-364 Service Manual

RM-364
System Module Description
Board and module connections

Energy management

Battery and charging

BL-4U battery
The phone is powered by a 3-pole BL-4U 1000 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.
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