Battery Capacity

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 TypeCapacity (mAh)Typical Drain (mA)
9 V50015

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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