Description; Operation; Nickel-Cadmium Battery - Saft 4579 Component Maintenance Manual With Illustrated Parts List

1.

Description

The Nickel Cadmium Battery provides power either to the standby system or to start the
auxiliary power unit (APU). It is a nickel-cadmium type with sintered plate construction, and
uses a potassium hydroxide electrolyte. The battery consists of a case and cover, 20 cell
assemblies, and a temperature sensor assembly. The sensor assembly includes a
thermoswitch mounted on a plate against the end of the center row of cells. A charge control
thermistor is located between cells 6 and 9 in the center row of cells.
2.

Operation

The battery is charged on the aircraft by an on-board charger. The charge control thermistor
provides a signal to the charger to compensate the charge according to the battery
temperature. The thermostat will cut off the charger if the battery temperature exceeds a safe
operating limit.
Battery
Receptacle
Temperature
Sensor
Assembly
Connector
SAFT AMERICA INC.
COMPONENT MAINTENANCE MANUAL
4579
DESCRIPTION AND OPERATION

Nickel-Cadmium Battery

Figure 1
Battery
Cover
Battery
Case
24-31-05
PAGE 1
Jan 30/98