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Button batteries, also referred to as coin cells, coin batteries or button cells, are circular, non-rechargeable batteries. They are used to power electronic devices, such as clocks, remote control toys and wristwatches. You can learn more in our [button batteries guide](/web/content/discovery/ideas-and-advice/button-batteries-guide).

### Sizes:

The most common naming standard is from the International Electrotechnical Commission or IEC. This typically consists of 2 letters, followed by 3 or 4 numbers.

The first letter defines the chemistry:

- L – Alkaline manganese dioxide
- S – Silver oxide
- P – Zinc-air
- C – Lithium manganese dioxide
- B – Lithium carbon monofluoride
- G – Lithium copper oxide

The second letter defines the shape:

- R – Round
- F – Flat
- S – Square
- P – All others that aren't defined as round, flat or square.

The numbers that follow the letters reference the diameter and the height. If the number ends with 1025, the battery has a 10 mm diameter and a 2.5 mm height.

### Applications:

Due to their size, button batteries are used for smaller electronic devices. Standard domestic applications include watches, scales, remote controls and calculators. They can be found in greeting cards, and are used to power small LEDs or speakers within the card.

Coin batteries can also be used to power medical devices such as hearing aids, implantable defibrillators and pacemakers.

### Which battery should I use?

Coin batteries have a very long shelf life. They have low levels of self-discharge which means they are able to hold their charge for a long time without losing any power. Coin cells are constructed with 1 of 3 types of battery chemistry. This can help you to choose the most suitable battery for your application.

**Alkaline button batteries:**

These are an economic solution as they are cheaper than lithium or silver oxide batteries. They do not maintain constant voltage throughout their lifespan like other batteries do. This means that the voltage drops consistently and they typically last half as long as lithium or silver oxide batteries. They have less capacity than silver oxide and lithium batteries.

**Silver oxide and lithium button batteries:**

Lithium and silver oxide coin batteries have stable voltage throughout their lifespan. Unlike alkaline batteries, they are subject to a drop in voltage quite suddenly as they approach end of life. They are more resistant to corrosion and have better leakage resistance. The main difference between silver oxide and lithium batteries is the voltage. Lithium batteries provide voltage of 3 V while silver oxide batteries offer 1.5 V.



Keep your small electronic devices running with our selection of button batteries, including the CR2032 battery.

Button Batteries, CR2032, LR44, CR2450 | RS

Button Batteries

Energizer CR2430 Button Batteries 24.5mm Diameter

Energizer CR1220 Button Batteries 12.5mm Diameter

Duracell Procell CR2025 Button Battery, 3V

Panasonic CR2025 Button Battery 20mm Diameter

RS PRO CR1220 Button Battery 12.5mm Diameter

Varta CR2032 Button Battery 20mm Diameter

Varta CR2430 Button Battery 24.5mm Diameter

Shop our range of CR2025 Batteries. Browse our latest CR2025 Batteries offers. Find out more today at RS.

CR2025 Batteries | RS

Shop our range of CR2450 Batteries. Browse our latest CR2450 Batteries offers. Find out more today at RS.

CR2450 Batteries | RS

Buy our range of button batteries cr2032. Browse our latest button batteries offers. Don't miss out on our latest deals!

Button Batteries CR2032 | RS

Buy our range of 3v button batteries. Browse our latest button batteries offers. Don't miss out on our latest deals!

3V Button Batteries | RS

Buy Duracell Button Batteries. Browse our latest Duracell Button Batteries offers. Free Next Day Delivery.

Duracell Button Batteries | RS

Buy Energizer Button Batteries. Browse our latest Energizer Button Batteries offers. Free Next Day Delivery.

Energizer Button Batteries | RS

Buy Murata Button Batteries. Browse our latest Murata Button Batteries offers. Free Next Day Delivery.

Murata Button Batteries | RS

Buy Varta Button Batteries. Browse our latest Varta Button Batteries offers. Free Next Day Delivery.

Varta Button Batteries | RS

Panasonic coin cell batteries can be used to power electronic devices, such as clocks, remote control toys and wristwatches.

Panasonic Button Batteries and Coin Cells | RS

<p>Panasonic coin cell batteries can be used to power electronic devices, such as clocks, remote control toys and wristwatches. Due to their size, button batteries are used for smaller electronic devices. Standard domestic applications include watches, scales, remote controls and calculators. They can be found in greeting cards and are used to power small LEDs or speakers within the card. Coin batteries can also be used to power medical devices such as hearing aids, implantable defibrillators and pacemakers.</p><h2>Sizes:</h2><p>The most common naming standard is from the International Electrotechnical Commission or IEC. This typically consists of 2 letters, followed by 3 or 4 numbers. The first letter defines the chemistry:</p><ul><li>L – Alkaline manganese dioxide</li><li>S – Silver oxide</li><li>P – Zinc-air</li><li>C – Lithium manganese dioxide</li><li>B – Lithium carbon monofluoride</li><li>G – Lithium copper oxide</li></ul><p>The second letter defines the shape:</p><ul><li>R – Round</li><li>F – Flat</li><li>S – Square</li><li>P – All others that aren't defined as round, flat or square.</li></ul><p>The numbers that follow the letters reference the diameter and the height. If the number ends with 1025, the battery has a 10 mm diameter and a 2.5 mm height.</p>

Hearing Aid batteries available in sizes 312 and 13 from RS.

Hearing Aid Batteries – Size 312 and 13 | RS

<p>Hearing aid batteries are efficient, long lasting button batteries that are typically manufactured with zinc-air chemistry, which aids its shelf life when sealed as zinc-air cells do not generate power without air.</p><h2>Sizes</h2><p>Hearing Aid batteries usually come in two sizes: size 312 and size 13.</p>

Browse our range of CR2016 batteries from leading brands including our own trusted brand RS Pro.

CR2016 Batteries, CR2016 3V Coin Cells | RS

<p>A range of CR2016 batteries from leading brands including our own trusted brand RS Pro. CR2016 batteries are 3V lithium batteries which are used in devices such as watches, car keys and electronic toys.</p><h2>Applications:</h2><p>Due to their size, button batteries are used for smaller electronic devices. Standard domestic applications include watches, scales, remote controls and calculators. They can be found in greeting cards and are used to power small LEDs or speakers within the card. Coin batteries can also be used to power medical devices such as hearing aids, implantable defibrillators and pacemakers.</p><h2>Silver oxide and lithium button batteries:</h2><p>Lithium and silver oxide coin batteries have stable voltage throughout their lifespan. Unlike alkaline batteries, they are subject to a drop in voltage quite suddenly as they approach end of life. They are more resistant to corrosion and have better leakage resistance. The main difference between silver oxide and lithium batteries is the voltage. Lithium batteries provide voltage of 3 V while silver oxide batteries offer 1.5 V.</p>

Shop our range of Procell Button Batteries. Free Next Day Delivery. Browse our latest Procell Button Battery offers.

Procell Button Batteries | RS

<p>Procell Button batteries are a range of professional-grade alkaline batteries by Duracell. They're designed for high-drain devices and professional use, known for reliability in challenging conditions like healthcare, manufacturing, and industrial settings.</p><p>These Button batteries are commonly used in various industries, including healthcare, manufacturing, industrial, and professional settings. They are often used in devices such as wireless microphones, remote controls, medical devices, industrial sensors, and other equipment that demands consistent and dependable power performance.</p>

3V Button Batteries

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