When two or more electric cells are connected together as a source of current, it's called a battery.

There are two main ways to connect cells in a battery:

* Series Connection: Cells are connected end-to-end, with the positive terminal of one cell connected to the negative terminal of the next. This increases the voltage of the battery (total voltage is the sum of individual cell voltages).

* Parallel Connection: Cells are connected with all positive terminals together and all negative terminals together. This increases the current capacity of the battery (total current is the sum of individual cell currents).

Here's a table summarizing the differences:

| Connection Type | Effect on Voltage | Effect on Current Capacity |

|---|---|---|

| Series | Increases | Remains the same |

| Parallel | Remains the same | Increases |

You can also combine series and parallel connections to create batteries with specific voltage and current capacity requirements.