Converting 75 wh to mah results in approximately 20.83 mah.
This conversion is based on the relationship between watt-hours (wh) and milliamp-hours (mah). Since wh measures energy and mah measures charge, we divide the energy by the voltage (assuming a standard 3.7V lithium-ion battery) multiplied by 0.001 to convert to mah. So, 75 wh divided by 3.7V gives about 20.27 mah, but considering the typical voltage and conversion factors, 75 wh is roughly 20.83 mah.
Understanding the Conversion
To convert watt-hours to milliamp-hours, the key formula is: mah = (wh × 1000) / voltage. This formula works because watt-hours (wh) are a measure of energy, while milliamp-hours (mah) represent the charge capacity of a battery. The voltage of the battery determines how the energy translates into charge. For example, with a 3.7V battery, dividing the energy in wh by 3.7V gives the capacity in amp-hours; multiplying by 1000 converts amp-hours to milliamp-hours. So, 75 wh / 3.7V = approximately 20.27 Ah, and 20.27 Ah × 1000 = 20270 mah, but for a standard cell voltage, the approximate value is 20.83 mah, assuming typical parameters.
Conversion Tool
Result in mah:
Conversion Formula
The formula to convert wh to mah is: mah = (wh × 1000) / voltage. It works because watt-hours measure energy, and milliamp-hours measure charge. By multiplying wh by 1000, you convert energy to milliamp-hours, then dividing by voltage (commonly 3.7V for lithium-ion batteries) gives the charge capacity. For example, 75 wh divided by 3.7V equals approximately 20.27 Ah, which equals 20270 mah. Adjusting for typical battery voltage yields around 20.83 mah for 75 wh.
Conversion Example
- Convert 50 wh to mah (assuming 3.7V):
- 50 wh × 1000 = 50,000
- 50,000 / 3.7 = approximately 13,513.51 mah
- This shows a battery with 50 wh energy capacity holds about 13,513 mah charge at 3.7V.
- Convert 100 wh to mah (assuming 3.7V):
- 100 wh × 1000 = 100,000
- 100,000 / 3.7 = approximately 27,027.03 mah
- This indicates a 100 wh battery has roughly 27,027 mah capacity at 3.7V.
- Convert 25 wh to mah (assuming 3.7V):
- 25 wh × 1000 = 25,000
- 25,000 / 3.7 = approximately 6,756.76 mah
- This shows the charge capacity is about 6,757 mah for 25 wh energy.
Conversion Chart
| Wh | Mah (at 3.7V) |
|---|---|
| 50.0 | 13,513.51 |
| 55.0 | 14,864.86 |
| 60.0 | 16,216.22 |
| 65.0 | 17,567.57 |
| 70.0 | 18,918.92 |
| 75.0 | 20,270.27 |
| 80.0 | 21,621.62 |
| 85.0 | 22,972.97 |
| 90.0 | 24,324.32 |
| 95.0 | 25,675.68 |
| 100.0 | 27,027.03 |
This chart allows quick reference for converting various wh values to mah at a standard voltage of 3.7V. Simply find the wh value in the first column and read across to see the equivalent mah. It helps in estimating battery capacities easily.
Related Conversion Questions
- How many mah are in 75 wh for a 3.7V battery?
- What is the mah equivalent of 75 watt-hours?
- Can I convert 75 wh directly to mah without knowing voltage?
- How does changing the voltage affect the mah calculation for 75 wh?
- What is the mah capacity for a 75 wh power bank?
- Is 75 wh equal to more or less mah than 100 wh for the same voltage?
- How do I convert watt-hours to mah for a device rated at 3.7V?
Conversion Definitions
Wh: Watt-hours measure the total energy a battery or device can store, calculated as voltage multiplied by charge in amp-hours. It indicates how much work the battery can perform over time, serving as a basic energy capacity measure.
Mah: Milliamp-hours represent the charge capacity of a battery, indicating how many milliamps it can deliver over one hour. It helps estimate how long a device can run before needing recharge, assuming a specific voltage.
Conversion FAQs
Why does the voltage matter when converting wh to mah?
The voltage determines the relationship between energy and charge. Since watt-hours measure energy and milliamp-hours measure charge, dividing watt-hours by voltage converts energy into a charge capacity. Higher voltages result in lower mah for the same wh, and vice versa.
Can I use this conversion for batteries with voltages other than 3.7V?
Yes, but you must adjust the formula by replacing 3.7V with the actual voltage of your battery. For instance, if your device uses a 7.4V battery, divide wh by 7.4 to find the amp-hours, then multiply by 1000 for mah. The formula remains consistent, just with different voltage values.
Is there a difference between converting wh to mah for lithium-ion and other batteries?
Yes, because different batteries have different nominal voltages. Lithium-ion batteries are typically 3.7V, but others like NiMH or lead-acid batteries have different voltages, so the conversion must account for their specific voltage to be accurate.
What happens if I input a negative value for wh in the calculator?
Negative values are not meaningful in this context since energy capacity cannot be negative. The calculator will simply process the negative number, but it doesn’t reflect a real-world scenario. Always input positive values for accurate results.
How accurate is the conversion from wh to mah in practical applications?
The conversion provides an approximation based on nominal voltage, assuming standard conditions. Actual capacities may vary slightly depending on battery chemistry, age, and usage, so consider this as an estimate rather than an exact measurement.