Battery capacity (Ah) is defined as a product of the current that is drawn from the battery while the battery is able to supply the load until its voltage is dropped to lower than a certain value for each cell.
Here below are some conservative power ratings for good quality alkaline-manganese dioxide batteries, which are available in your near by groceries.
| Battery Type | Capacity (mAh) | Typical Drain (mA) |
| AAA | 1000 | 10 |
| N | 650 | 10 |
| 9 V | 500 | 15 |
| AA | 2400 | 50 |
| C | 6000 | 100 |
| D | 13000 | 200 |
Lower the current drawn, better the capacity of a battery. To find out battery life, divide the capacity by the actual load current to get the hours of life.
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