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The designation CR2032 is the identifier of a button cell that can be found in various devices. Among other things, it is used as a backup battery in computers (so-called BIOS battery) or other electronic devices. They can also be found in Bluetooth chest straps, LED collars for dogs, remote controls, radio bells, watches or scientific instruments. Chemically speaking, the button cell works up Lithium manganese dioxide based.
The datasheet (here as PDF) via the CR2032 button cell shows that the battery has a voltage of 3.0 volts and a capacity of approximately 240 mAh. Due to their low self-discharge, button cells are often used in devices that have a very low power consumption, but should be able to do without changing the battery for many months. The self-discharge is approximately 1% per year. In this way, it is often used for several years in devices with very low power requirements.
The dimensions of the CR2032 are approx. 19,9 mm in diameter and 3,1 mm in height. The anode (+ pole) is connected to the outer shell and the top, while the cathode (- pole) is the pole on the bottom.
You can buy the CR2032 button cell either as a single battery or in a set of 5 if you need the replacement batteries more often. I have simply listed the bestsellers of the CR2032 batteries here so that you have a small selection.
There are a few other offers that also seem well rated at first glance, but when you read the reviews, the comment is very often that the batteries were probably overlaid and were empty after a few days.
The CR button cells always have a diameter of 20 mm. The 32 in CR 2032 stands for 3,2 mm height. So there is only one size for CR 2032 cells.
CR2025 cells are 2,5mm high. CR2032 button cells, however, 3,2mm. However, both have a diameter of 20 mm, a nominal voltage of 3 V and are round cells based on lithium.
In principle it works because they both have the same voltage, but the CR2032 button cell is 0,7 mm thicker than the CR2025. Otherwise, both cells offer 3 volts and can be used in remote controls or kitchen scales.
The letters "CR" stand for lithium round cell. The four numbers after the CR stand for the dimensions. The CR2032 is a lithium round cell with a diameter of 20 mm and a height of 3,2 mm.
A test laboratory in Wilhelmshaven tested button cells for a magazine and examined the nine most frequently sold in the test field. The button cells "Energizer" were rated as the test winner.
The shelf life depends on the consumption of the device. The capacity of the CR2032 is 220 mAh. They usually last one to two years in remote controls.
"CR" stands for lithium round cell. The four digits stand for the dimensions, with the "20" standing for 20 mm in diameter and the "32" for 3,2 mm in height.
With button cells like the CR2025 or the CR2032, the positive pole is the "sleeve", while the negative pole is the small metal surface on the underside. As a rule, a "+" and the battery designation are stamped on the positive pole.
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Jens has been running the blog since 2012. He appears as Sir Apfelot for his readers and helps them with problems of a technical nature. In his free time he drives electric unicycles, takes photos (preferably with his iPhone, of course), climbs around in the Hessian mountains or hikes with the family. His articles deal with Apple products, news from the world of drones or solutions for current bugs.
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