One of the most famous battery formats or batteries are the CR2032, the typical button cells that have a large number of devices. From some calculators, to the motherboards of computers to keep the time and BIOS/UEFI settings, to clocks, knobs, headphones, etc. This type of battery is characterized by its great durability and its reduced size compared to other formats such as AAA, AA, C, D and 9V.
They are available from different brands, such as Sony, Duracell, Maxell, and many other manufacturers. Their price is around 1.75 or 2 euros, although you can find blister packs with several CR2032 batteries for cheap prices when buying them in packs. The price and autonomy is not the only thing that makes them attractive, also their size, so they are perfect for small devices where you want great mobility or reduce the size of the battery to the maximum.
Button cells are encapsulated in a small metal button package, hence the name. On one side they have the positive pole, which corresponds to the side with the largest diameter, that is, where they usually have the mark and inscriptions. On the back side is the negative pole. To connect them, they usually have a contact with a base with a conductor that makes contact with the negative pole and a tab that makes contact on the sides and the high area (+). This allows the battery to be lifted from one side to unlock and replace it easily.
As for the material that composes them, it can be mercury (in disuse for not being respectful with the environment), cadmium, lithium, etc. The load they contain is sometimes sufficient to supply energy for 3 or 5 years, depending on the consumption of the device. In addition to the low cost and long life, the voltage produced during discharge is very uniform, which makes them perfect for avoiding peaks or mismatches over time. Also the discharge temperature is low to be integrated in small devices.
The CR2032, like the other button cells, stands out for its high stability to environmental changes, something that other batteries do not support so well. It operates in a wide range of temperatures, from -20ºC to 60ºC. These temperatures make them perfect for both hot and cold environments. They are also good for storage, as they have less than 1% self-discharge per year, which allows them to be stored for 5 times longer than other batteries.
They are distributed in various formats that are different in size, type, voltages, capacity and weight, and even rechargeable, as you can see in the following table with some of the most popular ones:
|Denomination||Type||Voltage (V)||Capacity (mAh)||Weight (g)||Diameter (mm)||Height (mm)|
Specifications of the CR2032 and datasheets
The technical characteristics of this CR2032 battery are:
- Manufacturers: several
- Model: CR2032
- Type: Lithium
- Voltage: 3v
- Capacity: 235 mAh, that is, it can give 235 mA for 1 hour or about 112 mA in 2 hours, about 66 mA for 4 hours, and so on…
- Weight: 30 g
- Diameter: 20 mm
- Thickness: 3.20 mm
If you want to download a datasheet of the CR2032, you can go to the official websites of the different manufacturers, as for example, here you have one:
You can find several types of connectors on the market for this type of button cell, as you can see in the pictures above. They are very cheap, and you can solder them to the board with the pins included or connect them directly with wires, depending on the type.
Some connectors are classic, with that base connector and the upper tab as I mentioned before. Others are somewhat different, and allow you to slide the stack into a bridge around it. This way it stays in contact on both sides, but they can be a bit complicated to remove if the working dimensions are small. Sometimes it is not easy to slide it out and replace it.
Others are clip-on, with a long terminal that will catch the stack at the top and press it against the base connector. There are also some that include a box that can ‘hold’ one or more batteries and have a cable for easy connection to jumpers.
That’s all about the CR2032 battery, I hope I’ve been helpful… Any doubt or contribution, don’t forget to leave your comments.