What happens to the voltage when battery cells are connected in parallel?

When battery cells are connected in parallel, the overall voltage of the system remains the same as the voltage of a single cell. This is because in a parallel configuration, each battery cell shares the same positive and negative terminals, and they essentially maintain the same voltage across their terminals.

The key effect of connecting batteries in parallel is on the current capacity (amperage) of the system. The total current that can be drawn from the parallel combination increases, allowing the system to supply more power without increasing the voltage. Therefore, while the choice suggests that the voltage increases, the accurate understanding is that the voltage remains unchanged, while the available amperage or capacity to provide current increases.

In summary, connecting battery cells in parallel keeps the voltage constant, while the total amperage increases, enhancing the overall capability of the battery system to supply current. The correct realization is that no voltage change occurs.