Small Battery Charger

Ni Cd Battery Charger

The nickel-cadmium battery is a popular type of rechargeable battery for portable electronics and toys using the metals nickel (Ni) and cadmium (Cd) as the active chemicals. They are sometimes used as a replacement for primary cells, such as heavy duty or alkaline, being available in many of the same sizes. It is commonly used in Mobile Phones, Rechargeable Torch, model airplanes etc.

Ni Cad Battery Charger Project, Nickel Cadmium charger project

                     Picture of Battery Charger Project

      In our project we have used 2AA size Ni-Cd Battery which is commonly available and can be used in many appliances. This circuit can also recharge common dry cell battery for fewer times at certain level.

Nickel-cadmium cells have potential of 1.2 V. So Nickel-cadmium batteries come in multiple of 1.2 V for eg 2.4V, 3.6V, 4.8V etc but it maintains constant voltage throughout their service life and about 0.8–1 V when discharged.

The chemical reaction which occurs in a NiCd battery is:

2 NiO(OH) + Cd + 2 H2O ↔ 2 Ni(OH)2 + Cd(OH)2

Ni Cad Battery Charger Circuit diagram, Nickel Cadmium charger

Circuit diagram of Nickel Cadmium (Ni Cd) battery charger

Here  is a simple and slow charger for better life of small Ni-Cd battery. Charge it for 6-12 hrs using this circuit.

Part List:

Step Down Transformer 0-6 V

Mains Cord

Diode 4007

Resistance 10 Ω  X2 Pcs


Battery Container