The document describes the composition and functioning of a nickel-cadmium (NiCad) battery. A NiCad battery consists of a cadmium anode, nickel oxide cathode, and potassium hydroxide electrolyte. During discharge, cadmium oxidizes to cadmium ions at the anode, producing around 1.4 volts. Recharging works by passing current in the opposite direction, reversing the electrode reactions and redepositing cadmium and nickel oxide. NiCad batteries provide fast charging, good load performance, and are smaller and lighter than lead batteries, though they are more expensive and have lower energy density.

2. DESCRIPTION
 IT CONSISTS OF CADIUM ANODE AND
A METAL GRID CONTAINING A PASTE
OF NiO2 ACTING AS A CATHODE
 THE ELECTROLYTE IN THE CELL IS KOH
IT IS REPRESNTED AS :

3. WORKING (Discharging)
 WHEN THE NICAD BATTERY OPERATES,
AT THE ANODE CADMIUM IS OXIDISED
TO Cd2+ IONS AND INSOLUBLE
Cd(OH)2 IS FORMED
 IT PRODUCES ABOUT 1.4V

4. REACTIONS
 AT ANODE:
 AT CATHODE :
 OVERALL REACTION :

5. RECHARGING THE CELL
 THE CURRENT PASSED IN OPPOSITE
DIRECTION
 THE ELLTRODE GET REVERSED
 Cd GETSDEPOSITED ON ANODE & NiO2
ON CATHODE
 NET REACTION:

6. ADVANTAGES
 FAST AND SIMPLE CHARGE
 GOOD LOAD PERFORMANCE
 SMALLER AND LIGHTER
 LONG LIFE THAN LEAD STORAGE CELL
 IT CAN PACKED IN A SEALED CONTAINER

7. DISAVANTAGE
 MORE EXPENSIVE THAN LEAD BATTERY
 RELATIVELY LOW ENERGY DENSITY
 ENVIRONMENTALLY UNFRIENDLY

8. USES
 CALCULATORS

9. USES
 ELECTRONIC FLASH UNITS

10. USES
 TRANSISTORS

11. USES
 CORDLESS APPLIANCES