A 1.45-volt battery is used for x amount of hours per day. What formula is used to determine its battery life?

The formula for determining battery life in this context is based on the concept of battery capacity and the rate at which the battery is drained, which is measured in milliamp hours (mAh). The correct formula, Battery life = MA hours/battery drain, essentially indicates that to calculate how long a battery will last, you take the total available capacity of the battery (in milliamp hours) and divide it by the current draw (or battery drain) in milliamps.

This relationship is fundamental because a battery's capacity tells us how much energy it can store, while the battery drain indicates how quickly that stored energy is being used. The result will give you an estimate of how many hours the battery will last under a specific load.

In practical terms, if you had a battery rated at 1000 mAh and your device was drawing 200 mA, applying this formula would show that the battery life is 1000 mAh / 200 mA = 5 hours, allowing users to understand the performance of the battery based on their usage scenarios. This understanding is crucial for both users and professionals in managing battery life effectively in various applications.