I get that, for a house/solar battery, it sort of makes sense as your typical energy usage would be measured in kWh on your bills. For the smaller devices, though, the chargers are usually rated in watts (especially if it’s USB-C), so why are the batteries specified in amp hours by the manufacturers?
In: 7
mAh doesn’t properly indicate capacity, since it doesn’t tell you the voltage, and therefore not the power. However, almost every phone and powerbank uses a 3.7V battery. Since the voltage is the same, you can use mAh to compare. However, large batteries often have different voltages, so they use kWh or Wh.
I guess the use of mAh is just a habit and no-one sees a need to change. And to the uninitiated, 5000 mAh probably sounds better than 18.5 Wh, even though it’s the same at 3.7V.
Latest Answers