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The conversion of 7.4 watt-hours (Wh) equals approximately 7400 milliamp-hours (mAh). This means that a device consuming 7.4 Wh has a capacity of about 7400 mAh when considering a voltage of 1.0V.
In detail, to convert Wh to mAh, you need to know the voltage because mAh depends on both energy (Wh) and voltage. The formula involves dividing the watt-hours by voltage (V), then multiplying by 1000 to get milliamp-hours. Since the voltage isn’t specified here, assuming a standard voltage of 1V simplifies the calculation, but usually, devices operate at specific voltages like 3.7V or 5V.
Conversion Result
Conversion Tool
Result in mah:
Conversion Formula
The formula to convert watt-hours to milliamp-hours is: mAh = (Wh × 1000) / Voltage. This works because watt-hours measure energy, while milliamp-hours measure charge capacity at a specific voltage. For example, at 3.7V, 1 Wh equals approximately 270 mAh. So, for 7.4 Wh: (7.4 × 1000) / 3.7 = 2000 mAh.
Conversion Example
- Convert 10 Wh at 3.7V:
- Step 1: Multiply 10 by 1000 → 10,000
- Step 2: Divide by 3.7V → 10,000 / 3.7 ≈ 2702.7 mAh
- Convert 5 Wh at 3.7V:
- Step 1: 5 × 1000 = 5000
- Step 2: 5000 / 3.7 ≈ 1351.4 mAh
- Convert 15 Wh at 3.7V:
- Step 1: 15 × 1000 = 15000
- Step 2: 15000 / 3.7 ≈ 4054.1 mAh
Conversion Chart
| Wh | mAh (at 3.7V) |
|---|---|
| -17.6 | -4486.5 |
| -12.4 | -3351.4 |
| -7.2 | -1946.5 |
| -2.0 | -540.5 |
| 3.2 | 864.9 |
| 8.4 | 2264.9 |
| 13.6 | 3684.3 |
| 18.8 | 5103.8 |
| 24.0 | 6514.1 |
| 29.2 | 7933.5 |
| 34.4 | 9352.7 |
This chart shows how watt-hours convert into milliamp-hours at 3.7V, helpful to quickly estimate capacities at different energy levels.
Related Conversion Questions
- What is the mah equivalent of 7.4 Wh at 3.7V?
- How many milliamp-hours are in 7.4 watt-hours for a 5V device?
- Convert 7.4 Wh to mah assuming a voltage of 12V?
- What is the mah value for 7.4 Wh battery at 3.7V?
- How do I convert watt-hours to milliamp-hours for different voltages?
- Can I convert 7.4 Wh to mah without knowing the voltage?
- What is the mah capacity of a battery rated at 7.4 Wh and 3.7V?
Conversion Definitions
Wh
Watt-hours (Wh) are a measure of energy representing the amount of work done or energy transferred over time, calculated by multiplying power (watts) by time (hours). It indicates the total energy capacity of a device or battery.
Mah
Milliamp-hours (mAh) measure charge capacity, indicating how much current a battery can deliver over time at a specific voltage. It is useful for comparing battery sizes and understanding how long devices can operate before recharge.
Conversion FAQs
How does voltage affect the conversion from Wh to mAh?
The voltage directly impacts the conversion because mAh depends on the energy in Wh divided by voltage. Higher voltage results in fewer mAh for the same Wh, while lower voltage yields higher mAh values. Accurate conversions need voltage specifics.
Can I convert Wh to mAh for any device without voltage information?
No, because mAh calculations require voltage data. Without knowing the voltage, the conversion can only be approximated assuming a standard voltage, which may not be accurate for specific batteries or devices.
Why do different batteries with same Wh have different mAh?
This occurs because battery capacity in mAh depends on voltage. Two batteries with same Wh but different voltages will have different mAh ratings, as mAh reflects charge capacity at that voltage level.
What is the significance of voltage in battery capacity conversions?
Voltage determines how energy translates into charge. Higher voltage batteries store the same energy with less charge (mAh), while lower voltage ones store more charge for the same energy. It’s crucial for accurate capacity assessments.
How do I choose the correct voltage for converting Wh to mAh?
Use the voltage specified by the battery or device manufacturer. Common voltages include 3.7V for lithium-ion batteries, 5V for USB devices, and others depending on the technology. Accurate voltage ensures precise conversions.