Battery capacity is typically measured in ampere-hours (Ah) and represents the amount of electric charge a battery can deliver over a specified period. The ampere-hour rating is a measure of the battery’s energy storage capacity. Here’s how battery capacity and amp-hour rating are calculated:

**Battery Capacity (Ah) = Current (A) × Time (h)**

In other words, the ampere-hour rating of a battery is calculated by multiplying the current (in amperes) that the battery can deliver by the time (in hours) it can sustain that current.

For example, if a battery can deliver a constant current of 10 amperes for 5 hours, its capacity would be calculated as:

**Battery Capacity = 10 A × 5 h = 50 Ah**

It’s important to note that the actual usable capacity of a battery can vary based on factors such as discharge rate, temperature, and age. In practice, battery manufacturers often provide different ampere-hour ratings for batteries based on specific discharge conditions. For example, a battery might have a higher capacity at lower discharge rates and a lower capacity at higher discharge rates.

When comparing battery capacities, it’s also important to consider the nominal voltage of the battery. For example, a 12-volt battery with a capacity of 100 Ah will store more energy than a 6-volt battery with the same capacity.

Keep in mind that the ampere-hour rating provides information about the battery’s energy storage capacity but doesn’t necessarily indicate its performance or how quickly it can deliver power. High current demands or rapid discharge rates can affect a battery’s effective capacity, as some batteries might not deliver their full capacity when discharged quickly.

Additionally, the capacity of rechargeable batteries (such as lithium-ion or lead-acid batteries) may degrade over time due to cycling and aging, which can impact their ampere-hour rating.

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