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.

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.