User Guide

Figure 18 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)

• VBAT (Battery voltage)

The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.

Figure 19 Battery connector

Charging

This phone is charged through the µUSB interface only (there is no separate connector for a charger).

Charging is controlled by energy management, and external components are needed to protect the baseband

module against EMC, reverse polarity and transient frequency deviation.

Charging a dead battery

Charging of a dead battery has to be carried out via one of the two approved NOKIA chargers (AC-6 and DC-6).

Charging via a PC is not allowed since this procedure is not including a current regulator (the battery can be

charged with a too high current level).

Normal and extreme voltages

Energy management is mainly carried out in the two Application Specific Integrated Circuits (ASICs) N2300

BETTY and N2200 AVILMA. These two circuits contains a number of regulators. In addition there are some

external regulators too.

In the table below normal and extreme voltages are shown when a BL-6P battery is used.

Table 8 Nominal voltages

Voltage Voltage [V] Condition

General Conditions

Nominal voltage 4.0

Lower extreme voltage 3.4

Higher extreme voltage (fast

charging) 4.4

RM-265

System Module

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