Energy Management; Battery And Charging - Nokia RM-721 Service Manual

RM-721; RM-722
System Module
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
Page 5 – 8 COMPANY CONFIDENTIAL Issue 1
Copyright © 2011 Nokia. All rights reserved.