• Audio block• SIM• FM radioModes of operationThe functional behavior can be divided into seven different states. Each of these states will affect the generalfunctionality of the phone:• No supply• Backup• Power off• Reset• Power on• Deep sleepBattery and chargingBattery• Type: BL-4C, Li-Ion• Capacity: 860 mAh• BSI resistor nominal value: 75 kΩBattery temperature is measured on the NTC on the main board.Battery connectorThe battery connector has three poles:• BSI (Battery size indicator)• GND (Ground)• VBAT (Battery voltage)The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.ChargingThis phone is charged through the smaller Nokia standard interface (2.0 mm plug). The old standard charger(3.5 mm) can be used together with the CA-44 charger adapter.RM-272; RM-273System modulePage 5 –10 COMPANY CONFIDENTIAL Issue 1Copyright © 2007 Nokia. All rights reserved.