Convert battery capacity from milliamp-hours (mAh) to watt-hours (Wh). Essential for comparing battery energy across different voltage platforms like laptops and drones.
mAh only tells you charge capacity, not energy. Wh is a true measure of energy that allows you to compare batteries of different voltages (e.g., a 12V vs 3.7V battery).
Most internal power bank cells are 3.7V lithium-ion, even if the output is 5V. Use 3.7V for accurate capacity calculations.
Wh = (mAh * V) / 1000