Button Batteries

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.

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 chemisty:
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?
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.

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Description Price Size Chemistry Nominal Voltage Capacity Diameter Dimensions Terminal Type
RS Stock No. 593-423
BrandRS PRO
MYR10.298
Each (In a Pack of 5)
units
SR44 Silver Oxide 1.55V 165mAh 11.6mm 11.6 x 5.4mm Standard
RS Stock No. 514-7766
BrandRS PRO
MYR2.816
Each (In a Pack of 5)
units
SR66 Silver Oxide 1.55V 25mAh 6.8mm 6.8 x 2.6mm Standard
RS Stock No. 593-401
BrandRS PRO
MYR4.082
Each (In a Pack of 5)
units
SR41 Silver Oxide 1.55V 42mAh 7.9mm 7.9 x 3.6mm Standard
RS Stock No. 514-7744
BrandRS PRO
MYR3.05
Each (In a Pack of 5)
units
SR59 Silver Oxide 1.55V 30mAh 7.9mm 7.9 x 2.65mm Standard
RS Stock No. 514-7700
BrandRS PRO
MYR5.492
Each (In a Pack of 5)
units
SR43 Silver Oxide 1.55V 120mAh 11.6mm 11.6 x 4.2mm Standard
RS Stock No. 801-0733
BrandRS PRO
MYR3.622
Each (In a Pack of 6)
units
PR70 Zinc Air 1.4V 100mAh 5.8mm 5.8 x 3.6mm Standard
RS Stock No. 798-9395
BrandDuracell
MYR4.102
Each (In a Pack of 6)
units
PR41 Zinc Air 1.4V - 7.9mm 7.9 x 3.6mm Standard
RS Stock No. 801-0721
BrandRS PRO
MYR3.017
Each (In a Pack of 6)
units
PR41 Zinc Air 1.4V 175mAh 7.9mm 7.9 x 3.6mm Standard
RS Stock No. 801-0727
BrandRS PRO
MYR2.28
Each (In a Pack of 6)
units
PR48 Zinc Air 1.4V 95mAh 7.9mm 7.9 x 5.4mm Standard