Battery cells connected in series

A series connection of batteries is achieved when the negative terminal of one battery  cell is connected to the positive terminal of another battery cell. 2 or more battery cells can be connected this way. An example of application of series connection of batteries is in the use of a touch light. Typically 2 batteries are connected in series for the touch light to come on.

In a series connection of batteries, voltage increases while current stays constant.

For example let’s say 2 battery cells are rated 1.5 V and 1A each and the cells are connected in series. Then the combined voltage for the series connection  becomes 1.5V + 1.5V = 3V but the current remains 1A.

Using the previous cell ratings, an electrical appliance that needs 6 volts to come on will require 4 battery cell connection in series

Battery cells connected in parallel.

A parallel connection of batteries is achieved when the positive terminal of one battery cell is connected to the positive terminal of another battery cell. The same is done to the negative terminals of the battery cells.

In a parallel battery connection, voltage stays constant but current increases.

For example let’s say 2 battery cells are rated 1.5V and 1A each. If the batteries are connected in parallel then their combined ratings are 1.5V and (1A +1A) = 2A

Application of series and parallel connection of battery cells

A very good knowledge of series and parallel connection of battery cells enables the development of battery packs with with different voltage ratings and capacities.