What happens to the current capacity when battery cells are connected in series?

When battery cells are connected in series, the current capacity remains the same across all cells in the circuit. This is because, in a series connection, the total voltage increases while the capacity (measured in amp-hours) does not. Each cell's current capacity, which is the maximum current it can supply, stays constant regardless of how many cells are added in series.

In a series configuration, the voltage of each cell adds up. For example, if you connect two 1.5V batteries in series, the total voltage becomes 3V, but the current capacity will still be that of a single cell. Thus, the characteristic that defines the current capacity—how much current the battery can provide at any given moment—remains unchanged.

Understanding this principle is crucial for applications that involve battery configurations, as it directly relates to how power systems are designed and how performance is expected from battery packs in various situations.