How to Convert Watt Hours (Wh) To Milliampere Hours (Mah) For Batteries


In today’s tech-driven age, understanding battery specifications is more crucial than ever. Whether you’re a tech enthusiast, a professional in the energy sector, or someone simply looking to make an informed decision on purchasing electronic devices, knowing the metrics that define battery capacity is paramount. 

The conversion between watt hours (Wh) and milliampere-hours (mAh) might seem technical, but with the right approach, it becomes a straightforward process. In today’s blog, we unravel the intricacies of these units and the significance of their conversion.

What are Watt Hours (Wh)?

Watt Hours (Wh) represent a unit of electrical energy that describes the total amount of power consumed over a specific duration. Essentially, it’s a measure of how much energy a device uses when it runs for an hour. 

For instance, a device rated at 10 Wh would consume 10 watts continuously over the span of an hour. As batteries power our favorite gadgets, from smartphones to electric cars, understanding Wh provides insights into the potential runtime and energy storage capabilities of these devices.

What Are Milliampere Hours (mAh)?

Milliampere-hours (mAh) is a unit that indicates the electrical charge capacity of a battery. It gives us an idea of how long a battery can provide a specific current before depleting. For instance, a battery rated at 1,000 mAh can deliver a current of 1,000 milliamperes (1 ampere) for one hour before running out. It’s a standard unit of measurement for smaller batteries, especially those in smartphones, tablets, and other handheld devices.

While milliampere-hours provide insights into the battery’s duration, there are also other factors that determine battery life, such as the type of device and usage patterns. 

Why Convert Watt Hours to Milliampere Hours?

Understanding both watt hours (Wh) and milliampere-hours (mAh) can give a comprehensive view of a battery’s capacity

Converting Wh to mAh or vice versa is often necessary for comparison, especially when purchasing or replacing batteries. It aids in ensuring compatibility and assessing performance across different devices. This conversion can help users make more informed decisions about their energy needs, ensuring they select a battery that delivers the desired longevity and power for their applications. 

How to Convert Wh to mAh

To convert Wh to mAh, use the formula:

mAh = Wh ÷ V x 1,000, where V represents the voltage of the battery.

For instance, for a 5Wh battery at 5 volts:

mAh = 5 ÷ 5 x 1,000 = 1,000 mAh

Thus, a 5Wh battery operating at 5 volts would have a capacity of 1,000 mAh. Always ensure you know the battery’s voltage for accurate conversion.

Wh to mAh Conversion Table

Watt Hours (Wh)Voltage (V)Milliampere Hours (mAh)
1 Wh3.7 V270.27 mAh
5 Wh3.7 V1351.35 mAh
10 Wh3.7 V2702.7 mAh
20 Wh3.7 V5405.41 mAh
25 Wh3.7 V6756.76 mAh
40 Wh3.7 V10810.81 mAh
45 Wh3.7 V12162.16 mAh››
50 Wh3.7 V13513.51 mAh
75 Wh3.7 V20270.27 mAh
100 Wh3.7 V27027.03 mAh

How to Convert kWh to mAh

To convert from kilowatt-hours (kWh) to milliampere-hours (mAh), use the formula:

mAh = kWh ÷ V x 1,000,000, where V denotes the battery’s voltage. 

For example, if you have a 0.005 kWh battery operating at 5 volts:

mAh = .005 ÷ 5 x 1,000,000

So, a battery with 0.005 kWh at 5 volts has a capacity of 1,000 mAh. Remember to ascertain the battery’s voltage for a precise conversion.

kWh to mAh Conversion Table

Kilowatt Hours (kWh)Amp Hours (Ah)Milliampere Hours (mAh)
0.01 kWh0.83 Ah830 mAh
0.02 kWh1.67 Ah1,670 mAh
0.025 kWh2.5 Ah2,500 mAh
0.05 kWh4.17 Ah4,170 mAh
0.1 kWh8.33 Ah8,330 mAh
0.5 kWh41.67 Ah41,670 mAh
1 kWh83.33 Ah83,330 mAh
2 kWh166.67 Ah166,670 mAh
10 kWh833.33 Ah833,330 mAh

Frequently Asked Questions

How Many Watt Hours Is a 10000mAh Battery?

To determine the watt hours (Wh) of a 10,000 mAh battery, multiply the battery’s voltage (V) by its capacity in milliampere-hours (mAh) and divide by 1,000. If the battery is 3.7 volts, for instance:
Wh = 10,000 mAh x 3.7 V ÷ 1,000 = 37 Wh
A 10,000 mAh battery at 3.7 volts equates to 37 watt hours.

How Many Watt Hours Is a 5000mAh Battery?

For a 5,000 mAh battery, you can determine the watt hours by multiplying the battery’s voltage (V) by the capacity in milliampere-hours. Using a 3.7-volt battery as an example:
Wh = 5,000 mAh x 3.7 V ÷ 1,000 = 18.5 Wh
Thus, a 5,000 mAh battery at 3.7 volts provides 18.5 watt hours of energy.

Final Thoughts

Navigating the landscape of battery capacities and conversions can seem intricate. Yet, understanding the fundamental difference between watt-hours and milliampere-hours and knowing how to convert between them offers clarity when assessing the potential and longevity of a power source.

Whether you’re comparing batteries for a device or seeking an efficient energy solution, these tools help you make informed choices. To further explore power solutions tailored to modern demands, consider diving into our cutting-edge power solutions at EcoFlow today!

EcoFlow is a portable power and renewable energy solutions company. Since its founding in 2017, EcoFlow has provided peace-of-mind power to customers in over 85 markets through its DELTA and RIVER product lines of portable power stations and eco-friendly accessories.

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