The button batteries They are small, inexpensive, and widely used in a wide range of small electronic devices. From watches to hearing aids, calculators and remote controls, their small size and versatility make them indispensable for everyday use. However, with so many types and compositions available on the market, selecting the right one can be a somewhat confusing task.
In this article, we'll explore the different types of button cell batteries, their chemical compositions, shapes, sizes, and the most common applications for each one. You'll also learn how to interpret the alphanumeric codes that accompany each model and why it's essential to take their specifications into account.
What are button cells?
A button battery It is a small, round, disk-shaped battery, generally used in electronic devices that require little power but need to operate for long periods of time. They are called this because their shape resembles that of a button, and unlike other batteries, they usually have a longer lifespan.
The button batteries They are found in a multitude of devices, from watches and hearing aids to car keys and some toys. Despite their small size, these batteries provide a reliable and long-lasting power source for devices that do not support the use of larger batteries.
One of the most important features of button cells is that they come in various sizes and with different chemical compositions, making them suitable for a wide range of uses. Depending on their composition, their ability to operate in different temperature conditions, their voltage and their shelf life also vary.
There are several types of button cell batteries, depending on the chemical components they are made from. Below we detail the most common models and their applications in daily life.
Types of button batteries
Button cell batteries are divided into several types based on their chemical composition and size. Each of them has unique characteristics that make them more or less suitable for certain electronic devices. The main types are:
Alkaline batteries (LR)
The alkaline batteries They are an economical and widely used option in devices that do not require much energy but are used constantly, such as calculators or measuring devices. They have a voltage of 1,5 volts And although their lifespan is shorter compared to other types of batteries, they are a common choice due to their affordable price.
Some models are the LR44 (one of the most popular), the LR41 and the LR43The latter, for example, is commonly used in low-end watches and toys. One of their main advantages is that they can operate in extreme temperature conditions, ensuring their performance in cold or hot climates.
Lithium batteries (CR and BR)
The lithium batteries are the preferred choice when stable and long-lasting performance is required. They feature a voltage of 3 volts and are known for their longevity compared to other types of batteries. They are common in devices such as remote controls, car keys, remote controls and computer motherboards.
The most commonly used models include the CR2032, the CR2025 and the CR2016. While all of these models are quite similar (they share the same diameter), they vary in thickness. For example, the CR2032 is thicker than the CR2025, which gives it a longer battery life.
Lithium coin cell batteries are ideal for long-lasting applications such as watches and medical devices due to their ability to maintain a constant voltage over time.
Silver Oxide (SR) Batteries
The silver oxide batteries They have a longer lifespan than alkaline batteries and are often used in devices that require precision in their operation, such as watches and some medical devices. They have a nominal voltage of 1,55 volts and as they discharge, their voltage remains constant, making them especially useful for devices that require stable performance over long periods of time.
They are more expensive than alkaline batteries, but their longer lifespan makes them a superior choice for precision devices. Popular models include the SR44, SR41 y SR43.
Zinc-air batteries
The zinc air batteries They are known for their use in hearing aids, due to their ability to provide a constant and long-lasting current. These batteries are only activated by contact with air, making them ideal for devices that are used intermittently. Their voltage is 1,4 volts.
Some common models of zinc-air batteries are the PR41 and the PR44These batteries, once opened to air, have a relatively short shelf life, so it is essential to store them properly before use.
Rechargeable batteries
Although the most common button cell batteries are usually disposable, there are also rechargeable batteries In this format, they are ideal for certain electronic devices that are frequently used, such as remote controls or toys. These batteries can be recharged several times, making them more economical in the long term and generating less waste.
Among the most common types of rechargeable button cells we find those of Nickel-metal hydride (NiMH) and those of ion lithiumThe former are popular for their ability to provide a constant charge, while lithium-ion batteries stand out for offering a large amount of power, making them ideal for smaller devices.
Button cell equivalencies
Many button cells have alternative names which vary depending on the manufacturer, which can lead to confusion. Fortunately, it is possible to find equivalencies for each model and ensure that you are using the correct battery for your device.
For example, batteries CR2032 They are also known as DL2032, BR2032 and ECR2032, depending on the manufacturer. The same goes for the model CR2025, which is also marketed under names such as DL2025 and BR2025.
To avoid errors when replacing a button cell, it is essential to look at the code printed on the original battery. This code contains key information about the chemical composition and size of the cell.
Alphanumeric codes and how to interpret them
Button cell batteries are identified by an alphanumeric code that gives you information about their composition and dimensions. Generally, the first letter indicates the main chemical component of the battery, while the numbers let you know its dimensions in millimeters.
For example, in a CR2032, the letter "C" refers to its composition (lithium), the "R" indicates that the battery is round, and the numbers "2032" indicate that it has a diameter of 20 mm and a thickness of 3,2 mm.
Storing button cell batteries
To ensure a long life for button cell batteries, it is important to store them properly. They should be kept in a cool, dry place away from direct sunlight. In addition, it is advisable to avoid contact with metal objects to prevent short circuits.
Most button cell batteries have a lifespan of up to 5 years in storage if stored correctly. However, it is important to pay attention to the expiry date, as after this time, batteries can start to lose their charge even if they have not been used.
How to recycle button cell batteries?
Proper recycling of button cells is essential to prevent the release of hazardous chemical compounds into the environment. Many of these batteries contain heavy metals and other substances that can be harmful if not managed properly.
Button cell batteries should be disposed of in specialized collection points. You can find battery collection containers in many shops, supermarkets and municipal recycling points. It is not advisable to throw them in the regular trash, as this can create a risk of contamination.