CR2032 Lithium Cell: Equivalent, Uses, Dimensions [FAQ]

CR2032 is a coin cell battery, also known as a lithium energizer, which is mainly used in high-powered devices such as hearing aids, glucose monitors and car keyless entry transmitters.

It provides a long service life for the devices in which it is incorporated, allowing them to cover it by creating a solid cylindrical shape. It can withstand high temperatures ranging from-22 to 140 F and can hold a bundle of power, enough to hold the charge for almost 8 years.

How to Measure a CR2032 Coin cell battery

Catalog

CR2032 General Description

Coin cell batteries such as CR2032 are generally used for small portable electronic devices such as wrist watches, pocket calculators, car keys with a lower input transmitter and hearing aids. They are usually of a compact size, 5-25mm in diameter and 1-6mm in height. The name defines the size of the battery as for CR2032, the first two digits are for the diameter and the second for the height or thickness of tenths of mm. So, according to this 20mm, the diameter is CR2032 and the thickness is 3.2mm.

Lithium button or coin cell batteries are a bit expensive than alkaline, but last longer, weigh less and have a wide operating temperature range.

CR2032 Features

• Lithium Coin Cell

• Nominal Voltage: 3.0 Volts

• Maximum Current: 0.19A

• Non - Rechargeable Disposal battery

• Typical Capacity: 240 mAh @ 20°C 15kΩ Load

• Service Life: ~720 Hrs @20°C 15kΩ Load

• Typical Weight: 3.0 grams (0.10 oz.)

• Operating Temp: -30C to 60C

• Self-Discharge: ~1% / year

CR2032 Equivalents

DL2032, BR2032

How to calculate the running time of CR2032 battery

The CR2032 is a commonly used battery for portable electronic applications. The battery life depends on many parameters, such as operating temperature, discharge current, dynamic loads, etc. But let us assume, for the sake of simplicity, that we are powering a normal load that consumes a constant current of 20mA at 20°C. Then in that case the capacity of our battery is 240mAh. This means that if we draw 240mA, then our battery will last for 1 hour and, similarly, if we draw 120mA, the battery will last for 2 hours. So for our application that consumes only 20mA, the battery should last for (240/20) 12 hours. However, due to the varying current and operating temperature of the system, this figure will not be accurate. 

Another important parameter to consider when deciding on your battery is the internal resistance of the battery. Unfortunately, every battery will have some internal resistance associated with it, which will prevent you from drawing the maximum current from the battery. The lower the IR (Internal Resistance) the more current you can draw from it and the higher the efficiency of the battery, the higher the IR of the battery as it ages or due to its operating environment.

When performing Pulse Test at 25°C, the continuous background drain at 15k ohms is 0.193mA @ 2.9V. And the pulse drain is 6.8mA @ 2.7V every 2 seconds *12 times/delay at 400 ohms.

Internal Resistance Characteristics

How to Use CR2032 Battery

There are many applications of coin cell batteries, the circuit below shows you how to connect the CR2032 coin cell battery to a simple LED circuit. CR2032 provides a nominal voltage of 3.0V, to power up a simple LED we need a minimum voltage of 2.2V so that we use the resistance to protect or limit the current.

CR2032 Applications

• Key fob for cars.

• Wireless doorbell for house.

• CMOS battery in computers.

• Glucometers

• Digital thermometers

• Digital altimeter

• Cyclocomputers

• Heart rate monitors

CR2032 Dimensions

Component Datasheet

CR2032 Datasheet

FAQ