A device or application that facilitates the conversion between milliampere-hours (mAh), a unit of electric charge often used to specify the capacity of batteries, and kilowatt-hours (kWh), a unit of energy commonly used to measure electricity consumption. For example, one might use such a tool to estimate how many hours a power bank rated in mAh can power a device that consumes energy measured in kWh.
This conversion is valuable for understanding the relationship between battery capacity and energy usage, especially when comparing devices with different energy specifications. Its utility lies in bridging the gap between the typical mAh rating of portable power sources and the kWh measurement found on electricity bills and appliance energy ratings. Historically, a need arose for this type of conversion due to the proliferation of battery-powered devices and the desire to relate their runtimes to standard energy consumption metrics.