Board and module connections
Energy management
Battery and charging
BL-5C battery
The phone is powered by a 3-pole BL-5C 1020 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 21 Battery pin order
RM-721; RM-722
System Module
Page 5 – 8 COMPANY CONFIDENTIAL Issue 1
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