How long does a battery provide power?

Answer:

This is highly dependent on the type of device being used. For example, you have a blister of 6 alkaline penlite (AA) batteries with the following specifications: 1,5V and 2500 mAh. The fist set of batteries are put into a wall clock, which will provide power for probably two years. These two years consist of a total of 17.520 hours. Counting backwards, the clock consumes less then 0,15 milli ampere per hour (mAh). However, in reality this is incorrect as factory specifications suggest the timepiece consumes 1 mAh. Both the stable power consumption and environment temperature contributed to the extended performance.

The second set of batteries is put into a small radio that consumes 300 mAh. If the radio is turned on continuously, it probably would provide eight hours of music. When turning down the volume the batteries will last longer and when turning up the volume this works the other way around. The last set of batteries go into a flashlight with a 1,5V, 1,0 Watt bulb. If the lamp is let continuously the batteries will die within approximately 3,5 hours.

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