Button cell batteries

Button cells are small, round, flat batteries, mainly used in small electronic devices requiring low power consumption but long life. They are so called because of their shape, which resembles a button on a piece of clothing. Here’s a complete overview of button cells, their characteristics and uses, and a few tips on how to choose the right one.

1. Button cell types

There are several different types of button cell, depending on their chemical composition. Each type is designed for specific uses, offering different voltages and performance.

a. Lithium button cell batteries

Lithium button cells are the most common type used in modern electronic devices. They deliver high voltage (typically 3 volts) and long life. They are ideal for devices requiring continuous power over a long period.

• Examples of models: CR2032, CR2025, CR2016 (the number indicates diameter and thickness, e.g. CR2032 is 20 mm in diameter and 3.2 mm thick).
• Applications: Car remote controls, watches, cameras, electronic scales, headlamps, and memory backup systems.

b. Silver oxide button cells

These batteries offer a voltage of 1.55 volts and are renowned for their stability and ability to maintain a constant voltage throughout their service life. They are often used in precision devices.

• Example models: SR626SW, SR44.
• Applications: Watches, hearing aids, precision instruments such as calculators and medical equipment.

c. Alkaline button cell batteries

Alkaline button cells are less expensive than other types, but have a shorter life. They also deliver a voltage of 1.5 volts, similar to silver oxide batteries, but are often less stable over time.

• Examples of models: LR44, AG13.
• Applications: Toys, calculators, small LED lamps, and certain types of remote control.

d. Zinc-air button cells

These batteries are specially designed for hearing aids. They offer a voltage of around 1.4 volts and are air-activated once their protective cover is removed. They provide high capacity in a compact size.

• Example models: PR44, PR41.
• Applications: Hearing aids and certain medical equipment.

2. Button cell characteristics

Button cells are popular for several reasons:

• Small size: their compact format means they can be used in devices where space is limited.
• Long life: Some button cells, particularly lithium batteries, can last for several years before needing to be replaced.
• Voltage stability: many models, such as silver oxide batteries, provide stable voltage throughout their life, which is crucial for precision devices.

3. Button cell applications

Button cells are used in a wide range of small electronic devices:

• Watches: Analog and digital watches often use silver oxide or lithium batteries for their stability and longevity.
• Hearing a ids: Zinc-air batteries are specially designed for these devices, offering long autonomy.
• Car remote controls: Lithium batteries, such as CR2032, are commonly used in car keys and remote controls.
• Calculators: Alkaline or silver oxide button cells power simple devices such as calculators.
• Toys and electronic gadgets: Toys and gadgets, often small ones, use button cells because of their reduced size.

4. How to choose a button cell?

Here are a few criteria to help you choose the right button cell for your needs:

• Chemical composition: Opt for lithium batteries for long life and higher voltage (3V). For devices requiring a lower but stable voltage (1.5V), silver oxide batteries are preferable.
• Size: Make sure you choose a button cell whose diameter and thickness correspond to the recommendations for your device (the code, such as CR2032, gives you precise indications of these dimensions).
• Service life: Depending on how the device is used, a long-life battery (such as a lithium battery) may be more advantageous, even if it’s more expensive.
• Brand: Choosing a recognized brand (such as Energizer, Duracell, or Panasonic) often guarantees better quality and longer life.

5. Storage and precautions for use

Button cell batteries must be handled with care, especially for safety reasons:

• Storage: We recommend storing button cells in a cool, dry place. Keep them in their original packaging to avoid any contact between them, which could cause a short-circuit.

• Handling: When installing, avoid touching both poles simultaneously, as this may affect battery life. Preferably use pliers to handle them.

• Safety: Button cells are dangerous if swallowed, especially for young children. They can cause serious injury or internal burns. It’s vital to keep them out of reach, and to dispose of them properly when worn.

6. Button cell recycling

Button cells contain chemical substances that can be harmful to the environment if disposed of with household waste. It is therefore important to recycle them at specialized collection points to minimize their ecological impact. Many stores and municipalities offer free recycling services for used batteries.