How to connect Batteries in Series?

Connecting batteries in Series is when you connect the positive terminal of one battery to the negative terminal of another battery.

Connecting batteries in series will increase the combined Voltage of the packs but the capacity will remain unchanged (or lowest capacity of the combined cells).  For example, if you have 4 x 3.2V (Volt) 200ah (amp hour) batteries connected in series, the total capacity will remain to be 200ah, however the voltage will increase to 12.8 Volts (4 x 3.2V).

When connecting cells/batteries in Series, the capacity of each battery should ideally be the same to ensure that one battery/cell in the circuit is not over charged/discharged.