Digital Photography Technology

The nickel cadmium battery, (NiCad), is a rechargeable battery. It is made up of nickel oxide hydroxide and metallic cadmium.

There are two types of nickel cadmium battery, sealed and vented. The sealed versions are used in electronic equipment, flashlights, toys, and other small pieces of equipment. The vented units are normally larger batteries, used in fixed applications, such as emergency power and electric vehicles,  The sealed units are what will be discussed here.

A nickel cadmium battery is used to replace primary cells, but due to their lower voltage, they may not perform as well. The reduced amp hour rating may also effect

A nickel cadmium battery voltage is a nominal 1.2 volts, where cells are 1.5 volts. Primary cells are AAA, AA, and D which are either zinc-carbon or alkaline. There are many variations in size and shape of these batteries, Nickel cadmium batteries have a low internal resistance, and when a load is applied, the voltage drop is very small. Primary cells have a relatively higher resistance, and there for, a higher drop is voltage.

Where higher voltage batteries are required, stacking cells can accomplish any voltage desired. Four cells (1.2 x 4 = 6 volts) and (1.2 x 10 =12volts).

Advantages of nickel cadmium batteries are the ability to be recharged many times, high inrush current, and sustain deep discharges. The price for the NiCad is higher, but offset by multiple charges.

The primary cell has a higher voltage rating, higher current, lower cost, but when it is discharged, it is thrown away.

The initial cost for a NiCad is higher, but over time, it will cost less.

It is up to the user and their preference which is the best choice.