The Wh to mAh calculator is an essential tool for converting the energy stored in a battery (expressed in watt-hours, Wh) to the amount of electric charge it can deliver (expressed in milliampere-hours, mAh). This tool simplifies the task of comparing batteries that may have their capacities listed in different units, making it easier for consumers, technicians, and enthusiasts to make informed decisions.
Formula of Wh to mAh Calculator
The conversion formula used by a Wh to mAh calculator is:
Where:
- Wh is the energy in watt-hours.
- V is the voltage in volts.
This formula helps translate the energy capacity of a battery into a more commonly understood charge capacity, which is crucial for practical applications like selecting the right battery for a device.
Conversion Table for Common Battery Types
To simplify the use of the Wh to mAh calculator, below is a conversion table for some common battery voltages, assuming the energy (Wh) is known:
| Battery Type (Voltage, V) | Energy (Wh) | Charge (mAh) |
|---|---|---|
| 3.7V (Standard Lithium) | 1 Wh | = (1 * 1000) / 3.7 = 270 mAh |
| 5V (USB power standard) | 1 Wh | = (1 * 1000) / 5 = 200 mAh |
| 12V (Car battery) | 1 Wh | = (1 * 1000) / 12 = 83 mAh |
This table can be used as a quick reference to convert Wh to mAh without performing manual calculations each time.
Example of Wh to mAh Calculator
Scenario
Suppose you have a battery that provides 20 Wh of energy at a voltage of 5 volts and you want to know how many milliampere-hours this corresponds to.
Calculation
Using the formula:
mAh = (Wh * 1000) / V
mAh = (20 * 1000) / 5 = 4000 mAh
This means a 20 Wh battery at 5 volts would provide 4000 mAh of charge.
Most Common FAQs
Answer: Converting watt-hours to milliampere-hours is crucial for understanding how long a battery will last under use. It allows users to compare batteries of different types and capacities on a uniform scale.
Answer: While you can use any voltage value, it is essential to use the correct voltage corresponding to the battery you are calculating for because the mAh capacity is dependent on the voltage.
Answer: No, the calculation formula (mAh = (Wh * 1000) / V) remains the same. However, the voltage must accurately reflect the battery’s specifications.