What are Wh and mAh? How to convert Wh to mAh and vice versa

The two units of measurement mAh and Wh are frequently used to measure battery capacity on modern technology devices such as phones, laptops, etc. Surely you, have also heard of it, but to understand and correct it. To identify each type, let’s find out with Tnhelearning.edu.vn through the article below.

What is the unit of measure Wh?

Wh (short for Watt hour ) also known as Watt/hour , is the unit used to measure the electrical energy consumed by the device in 1 hour . (first)

For example: A 10W power bank with a capacity of 10W, works for 3 hours. So the power consumption of the phone charger will be 10 x 3 = 30 (Wh)

What is the unit of measure mAh?

mAh, also known as milliamp hour , is the unit used to measure the charge of a battery. In fact, mAh is used to calculate the capacity (capacity to store electricity) of small batteries such as phone batteries, power banks,… (2)

Example: Your phone has a battery capacity of 5000 mAh, which means the battery will provide 1000 mA of current for your phone to use for 5 hours.

Formula to convert between mAh to Wh in reverse

Formula to convert mAh to Wh

For example: A phone battery with a capacity of 5000 mAh, operating at a voltage of 3V, then: Wh = 5000 x 3/1000 = 15 Wh.

Wh → mAh . conversion formula

For example: A battery with a rating of 16 Wh, operating at a voltage of 7V, is: mAh = (16 x 1000)/7 = 2280 mAh.

Difference between Wh and mAh

From the definition of Wh and mAh, we can easily see the difference between them:

• Wh is a unit used to measure electrical energy consumption, commonly used for laptop batteries
• mAh is a unit of measurement for the capacity of a phone’s battery to hold electricity.

In fact, measuring battery capacity in Wh is considered more accurate and is applied in many aspects of life (For example, the standard of electrical equipment allowed to be carried on an airplane).

When comparing two batteries with only mAh units, you need to make sure they operate at the same Volts . Otherwise, the results will be incorrect. However, some manufacturers sometimes do not announce the Volt level of the battery, which often causes confusion for customers.

For example: Phone A battery with 6000mAh capacity operates at 6V voltage, Phone B battery with 6000mAh capacity operates at 5V voltage.

Battery A: Wh = (6000 x 6)/1000 = 36 WhPin B: Wh = (6000 x 5)/1000 = 30 WhTa see that battery A has a larger capacity than battery B.

Reference source:

(1) Technology textbook 8/page 168

(2) Physics Textbook 7/page 66

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