Wh to mAh Calculator

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What is mAh from Wh and Why Should You Care?

Have you ever wondered how long your battery can keep your device running before it needs a recharge? Or maybe you're curious about the energy capacity of different batteries for your gadgets? Well, that's where the magic of mAh from Wh comes in!

mAh stands for milliamp-hour, a unit measuring electric power over time. It's like knowing how much fuel you have in your tank! When it comes to batteries, especially those in our smartphones, laptops, and other gizmos, understanding mAh can help you anticipate battery life. Whether you're a tech enthusiast, an eco-conscious consumer, or just tired of your phone dying halfway through the day, knowing the mAh value can help you choose the best battery for your needs.

How to Calculate mAh from Wh

If you're wondering how to actually get from Wh (watt-hours) to mAh, fear not! The formula is straightforward.

[\text{mAh} = \frac{\text{Wh} \times 1000}{\text{Voltage (V)}}]

Where:

  • mAh: The milliamp-hours
  • Wh: The watt-hours
  • Voltage (V): The electric potential in volts

To break it down: multiply the watt-hours by 1000 (because there are 1000 milliamp-hours in one ampere-hour) and then divide by the battery's voltage.

Calculation Example

Let's dive into an example. Suppose you have a device that's powered by a battery with 480 Wh and it operates at a voltage of 24V. Here's how you'd find the mAh:

  1. Identify the given values:

    • Wh (watt-hours) = 480
    • Voltage (volts) = 24

  2. Apply the formula:

[\text{mAh} = \frac{480 \times 1000}{24}]

  1. Calculate:

[\text{mAh} = \frac{480000}{24} = 20000]

So, the battery capacity is 20,000 mAh.

Now you know that this battery can theoretically provide 1 milliamp for 20,000 hours, or 20 amperes for 1 hour.

Frequently Asked Questions

mAh stands for milliamp-hours and measures the energy capacity of a battery. A higher mAh rating means your device can run longer on a single charge.

Higher voltage means more power delivered at once but reduces the mAh number when converting from watt-hours. The total energy stays the same.

Phone batteries use mAh because most run at a standard 3.7V, making mAh a convenient comparison metric. For devices with different voltages, Wh is more accurate for comparing total energy.

Generally yes, higher mAh means more energy capacity and longer runtime. However, higher capacity batteries are often larger and heavier, which may not be ideal for all devices.