User Guide

Energy management

Battery and charging

BP-4L battery

The phone is powered by a 3-pole BP-4L battery S-pack 1500 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 47 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)

Figure 48 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.

Figure 49 Small (right) and wide (left) charger plugs

RM-437; RM-449; RM-450

System Module and User Interface

Issue 1 COMPANY CONFIDENTIAL Page 6 –7