User Guide

Energy management

Battery and charging

BL-4B battery

The phone is powered by a BL-4B battery block. It provides a capacity of 700 mAh minimum and contains a

BSI resistor for the battery identification. Its battery interface is based on blade type connector where the

transceiver side has blades and the counter parts are on battery side.

Figure 92 Battery pin order

The battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line.

This is located on the main PWB, at the place where the phone temperature is closest to the battery

temperature.

Battery connector

The battery connector is a blade connector. It has three blades;

• 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.

Figure 93 Blade battery connector

Charging

This phone is charged through the smaller Nokia standard interface (2.0 mm plug). The wider standard

charger (3.5 mm) can be used together with the CA-44 charger adapter.

RM-135

Nokia Customer Care System Module and User Interface

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