The conversion of 20000 mah to watts results in approximately 74.4 watts. This means that a battery with 20000 mAh capacity provides about 74.4 watt-hours of energy when considering a standard voltage.
To convert mah (milliamp-hours) to watts, you need to know the voltage of the battery, since watt-hours are calculated by multiplying the capacity in amp-hours by the voltage. The formula is: Watts = (mAh / 1000) * Voltage. For example, with a common lithium-ion battery voltage of 3.7V, 20000 mah equals (20000 / 1000) * 3.7 = 74 watts.
Conversion Result
20000 mah at 3.7 volts equals approximately 74.4 watts.
Conversion Tool
Result in watts:
Conversion Formula
The formula to convert mah to watts involves multiplying the capacity in amp-hours by the battery voltage. Since mah is milliamp-hours, it must be divided by 1000 to convert to amp-hours. Then, multiplying by voltage gives watt-hours. For example, a 20000 mah battery at 3.7V: (20000 / 1000) * 3.7 = 74 watt-hours. This calculation works because watt-hours measure energy, combining current capacity and voltage.
Conversion Example
- Suppose you have a 15000 mah battery at 3.7V:
- – Convert mah to amp-hours: 15000 / 1000 = 15 Ah
- – Multiply by voltage: 15 * 3.7 = 55.5 watt-hours
- – Result: 55.5 watts
- For a 25000 mah power bank at 3.7V:
- – 25000 / 1000 = 25 Ah
- – 25 * 3.7 = 92.5 watt-hours
- – Final watt value: 92.5 watts
- Converting 10000 mah at 3.7V:
- – 10000 / 1000 = 10 Ah
- – 10 * 3.7 = 37 watt-hours
- – Total watt-hours: 37 watts
- For 5000 mah at 3.7V:
- – 5000 / 1000 = 5 Ah
- – 5 * 3.7 = 18.5 watt-hours
- – Result: 18.5 watts
Conversion Chart
| mah | Watts (approx.) |
|---|---|
| 19975.0 | 73.93 |
| 19980.0 | 73.93 |
| 19985.0 | 73.94 |
| 19990.0 | 73.94 |
| 19995.0 | 73.95 |
| 20000.0 | 74.00 |
| 20005.0 | 74.01 |
| 20010.0 | 74.01 |
| 20015.0 | 74.02 |
| 20020.0 | 74.02 |
| 20025.0 | 74.03 |
Use this chart to quickly see how different mah values translate into watts using the standard voltage of 3.7V. Read across the row to find the watt value corresponding to your mah capacity.
Related Conversion Questions
- How many watts are in a 20000 mah power bank at 3.7V?
- What is the watt-hour equivalent of 20000 mah in a lithium-ion battery?
- Can I convert mah to watts without knowing the voltage?
- What is the difference between mah and watt-hours for battery measurements?
- How does changing the voltage affect the watts calculation for 20000 mah?
- Is 20000 mah enough for a portable device to last a day?
- How do I convert mah to watts for a 5V device?
Conversion Definitions
“mah” (milliamp-hour) measures the electric charge a battery can deliver over time, indicating capacity. It reflects how much current a battery can supply for a specific period before recharging. It is a unit of electric charge used mainly for small batteries and portable devices.
“watts” (W) is a unit of power that indicates the rate of energy transfer or consumption. It combines voltage and current to show how much energy is used or produced per second. Watt-hours are used to measure total energy capacity over time, essential for understanding battery energy content.
Conversion FAQs
What voltage should I assume when converting mah to watts?
Typically, a standard lithium-ion battery voltage of 3.7V is used for calculations unless specific voltage data is provided. Using this voltage provides a close approximation for most portable device batteries. For other devices, the actual voltage should be used for precise conversion.
Can I convert mah directly to watts without voltage info?
No, because mah alone only indicates capacity in terms of charge over time. To find watts or watt-hours, you must know the voltage at which the battery operates. Without voltage, the conversion cannot be accurately performed.
Why does the watt value change with different voltages?
Watts depend on both current and voltage. Increasing voltage while keeping mah constant results in higher watt-hour capacity. Different devices may operate at different voltages, affecting their total energy output based on the same mah capacity.
Is 20000 mah a good capacity for a portable charger?
Yes, 20000 mah is generally considered a high capacity for portable chargers, capable of charging smartphones multiple times. Its usefulness depends on device power consumption, but it offers a substantial energy reserve for daily needs.
How do I calculate watt-hours for a battery with known mah and voltage?
Divide mah by 1000 to get amp-hours, then multiply by voltage: watt-hours = (mah / 1000) * voltage. This gives the total energy the battery can store, useful for comparing batteries or estimating device runtime.