User Guide

CC Technical Documentation System Module
RM-11
Issue 1 02/2004 ©2004 Nokia Corporation Confidential Page 9
Battery
BLD-3 Li-ion (inbox battery) is used as the main power source. The BLD-3 has a capacity
of 780 mAh.
Figure 3: Battery pack contacts
The BSI fixed resistor value indicates the type and default capacity of a battery. The
NTC-resistor measures the battery temperature.
Table 1: BLD-3 characteristics
Description Value
Nominal discharge cut-off voltage 3.1V
Nominal battery voltage 3.7V
Nominal charging voltage 4.2V
Maximum charger output current 850mA
Minimum charger output current 200mA
Cell pack impedance -20 ... 0
o
C
180mΩ max
Cell pack impedance 0 ... +20
o
C
150mΩ max
Cell pack impedance +20 ...+60
o
C
130mΩ max
Cell pack impedance +60 ...+80
o
C
250mΩ max
Table 2: Pin numbering of battery pack
Signal name Pin number Function
VBAT 1 Positive battery terminal
BSI 2 Battery capacity measurement (fixed resistor inside the
battery pack)
BTEMP 3 Battery temperature measurement (measured by ntc
resistor inside pack)
GND 4 Negative/common battery terminal
Charge
GND
2(BSI) 3(BTEMP) 4(GND)