Energy management
Battery and charging
BL-4S battery
The phone is powered by a 3-pole BL-4S 860 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 23 Battery pin order
The battery temperature can be measured from the UI flex.
Battery connector
The battery connector is a blade connector. It has three blades;
• BSI (Battery size indicator)
• GND (Ground)
RM-352; RM-354
System Module
Page 5 –8 COMPANY CONFIDENTIAL Issue 1
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