# Understanding What “Wh” Means on a Battery

Have you ever looked at the label on your battery pack and noticed the letters “Wh” printed near the voltage rating? If you’re wondering what this abbreviation means and how it affects your device, this article will give you all the answers.

## What Does Wh on Batteries Mean?

Wh stands for watt-hour, which is an energy measurement unit used to describe the amount of energy a battery can store or provide over time. It’s calculated by multiplying the battery’s voltage (V) by its capacity (Ah). For example, a 10 V battery with a capacity of 5 Ah has a watt-hour rating of 50 Wh.

## What Does 7.4 Wh Mean on a Battery?

A battery with a watt-hour rating of 7.4 Wh means it can deliver a constant power output of 7.4 watts for one hour before it’s fully drained. However, the actual runtime may vary depending on the device’s power consumption and efficiency.

## How Big is a 100 Wh Battery?

The physical size of a battery with a watt-hour rating of 100 Wh can vary greatly depending on its chemistry and design. For example, a 100 Wh lithium-ion battery used in laptops and drones can be as small as a deck of cards, while a lead-acid battery with the same rating used in electric vehicles can be as large as a microwave oven.

## How Long Will a 500 Wh Battery Last?

The runtime of a 500 Wh battery depends on the device’s power requirements and the battery’s efficiency. To calculate the approximate runtime, you can divide the battery’s watt-hour rating by the device’s power consumption in watts. For example, a device that consumes 10 watts of power will last for 50 hours on a fully charged 500 Wh battery.

In conclusion, understanding what “Wh” means on a battery is crucial when choosing the right battery for your device. It helps you determine the battery’s energy capacity and how long it can power your device. Always check the watt-hour rating on the battery label and compare it with the device’s power requirements to ensure optimal performance.

About the author, Phil Borges

Phil Borges is a battery aficionado. He's written extensively about batteries, and he loves nothing more than discussing the latest innovations in the industry. He has a deep understanding of how batteries work, and he's always on the lookout for new ways to improve their performance.