1. Dry Cell Batteries Dry cell batteries are not actually dry
The electrolyte is a paste instead of a liquid

2. Dry cells are more convenient to work with
As current flows through a bulb the
chemical energy stored in the battery
becomes light and heat energy.
When all available chemical energy
has been converted to other forms
of energy the battery is dead.

3. Rechargeable batteries can be reused
A battery charger runs a current backward
through the battery and changes
electrical energy to chemical energy
which is stored in the battery.

4. This cycle of charging and discharging
does not continue indefinitely because
some gases escape the cell and the
cells contain impurities.
Rechargeable batteries eventually
have to be replaced.

5. Types of rechargeable batteries
Lead- Acid

6. Nickel Cadmium
Ni - Cad

7. Nickel Metal Hydride
Ni - Mh

8. Lithium ion
Li - ion