Wh to mAh Calculator
Convert energy in watt-hours (Wh) to battery capacity in milliampere-hours (mAh).
Watt-hour to Milliampere-hour Converter
Common Wh to mAh Conversions
Click on these links to see instant conversions with common values:
Understanding Wh to mAh Conversion
Converting watt-hours (Wh) to milliampere-hours (mAh) is useful for determining the equivalent charge capacity of a battery when its energy content (Wh) and voltage are known.
Conversion Formula
Where:
• mAh = Battery capacity in Milliampere-hours
• Wh = Energy in Watt-hours
• V = Voltage in Volts
Key Concepts
- Watt-hour (Wh): A unit of electrical energy, representing the consumption of one watt of power for one hour. It is a more accurate measure of a battery's total energy content.
- Milliampere-hour (mAh): A unit of electric charge capacity, commonly used for small batteries. It represents the amount of current a battery can provide for one hour.
- Voltage (V): The electric potential difference of the battery.
Typical Battery Capacities (Wh and mAh)
| Device | Wh | Voltage (V) | Approx. mAh |
|---|---|---|---|
| Smartphone | 11.4 | 3.8 | 3000 |
| Tablet | 29.6 | 3.7 | 8000 |
| Laptop | 55.5 | 11.1 | 5000 |
| Power Bank | 100 | 5 | 20000 |
| AA Battery (rechargeable) | 2.4 | 1.2 | 2000 |
Frequently Asked Questions
Why convert Wh to mAh?
While Wh gives the total energy, mAh is often used to compare the runtime of batteries for devices that operate at a specific voltage. Converting Wh to mAh allows for a direct comparison of how long a battery might last in a device with a known current draw.
What is the difference between Wh and kWh?
Wh (watt-hour) and kWh (kilowatt-hour) are both units of energy. 1 kWh is simply 1000 Wh. kWh is typically used for larger energy measurements, like household electricity consumption, while Wh is used for smaller devices and batteries.