How much do you know about Button Battery?
Rose   utmel.com   2021-10-21 17:37:59

Topics covered in this article:
Ⅰ.What is Button Battery?
Ⅱ.The characteristics of various types of Button Battery
Ⅲ.How to test a Button Battery with a multimeter?
Ⅳ.What happens if a Button Battery is swallowed?

Ⅰ. What is Button Battery?

A Button Battery is a battery that has the appearance of a button but is actually a lithium battery. Lithium batteries have the advantages of lightness, durability, high stability, and long-lasting power because lithium is the lightest metal. The downside is that the power is limited and the price is prohibitively high. As a result, precision instruments are the most common use.

There are two types of button batteries: rechargeable and non-rechargeable. 3.6V rechargeable lithium-ion button batteries (LIR series) and 3V rechargeable lithium-ion button batteries (ML or VL series) are among the rechargeable options; no 3V lithium manganese button batteries (CR series) and 1.5V alkaline zinc manganese button batteries are both rechargeable (LR and SR series).

AG3, AG10, and AG13 batteries are the most common button batteries found in toys and gifts. On the computer motherboard, the battery type is CR2032, which is the same as CR2025 in electronic dictionaries and CR2016 or SR44 and SR626 in electronic timepieces. The most popular and cheapest button batteries are carbon button batteries.

The type of battery is indicated by the English letter in front of the model name, the size is indicated by the number, the first two digits indicate the diameter, and the final two numbers indicate the thickness.

6F22 (9V), 4F22 (6V), 15F20 (22.5V), 10A (9V), 11A (6V), 23A (12V), 25A (9V), 26A (6V), 27A (12V), 476A (6V), 120H7D (8.4V), 2X625A (3V), and so on are common standard types.


Ⅱ. The characteristics of various types of Button Battery

Lithium battery

A lithium manganese battery (code C) with a nominal voltage of 3V is a typical disposable lithium battery.

A lithium-carbon fluoride battery (code B) with a nominal voltage of 3V is another less frequent form of disposable lithium battery.

In addition, the ML lithium battery (code-named ML) is a regularly used secondary lithium battery with a nominal voltage of 3V.

The new IEC numbering technique is typically used for lithium battery size numbers. The diameter (in mm) is the first two digits, and the thickness (in 0.1mm) is the last two digits, whichever is closest. The dimensions of CR2032, for example, are 20mm in diameter and 3.2mm in thickness.


Silver oxide

The button battery has extended service life, huge capacity, and a wide range of uses, with the largest application being the button battery. The positive pole is silver oxide, the negative pole is metal zinc powder, and the electrolyte is potassium hydroxide or sodium hydroxide. The chemical reaction between zinc and silver oxide produces electricity. The silver oxide button battery has five thickness (height) specifications: 5.4mm, 4.2mm, 3.6mm, 2.6mm, and 2.1mm, and four diameter specifications: 11.6mm, 9.5mm, 7.9mm, and 6.8mm. One of them should be chosen based on the size of the area.


Silver peroxide

The battery's construction is nearly identical to that of a silver oxide button battery. The key distinction is that the battery's anode (glen pole) is constructed of silver peroxide.


Basic Manganese

The battery has a huge capacity, outstanding low-temperature performance, inexpensive materials, and a low price, and it can handle continuous discharge at a high current. The drawback is that the energy density is insufficient, and the discharge voltage is unstable. Manganese dioxide serves as the positive pole, zinc serves as the negative pole, and potassium hydroxide serves as the electrolyte in alkaline manganese button batteries. 1.5V is the nominal voltage.



It is also known as a mercury battery and has the ability to operate at high temperatures, as well as long-term storage, a constant discharge voltage, and superior mechanical features. However, it has poor low-temperature properties. The battery's positive electrode is mercury, the negative pole is zinc, and the electrolyte is either potassium or sodium hydroxide. It has a nominal voltage of 1.35 volts.



Lithium manganese disposable button batteries have a nominal voltage of 3V and a termination voltage of 2V.


Button Battery

0.1-0.2mA is the typical operating current. The cathode material is manganese dioxide, which has very stable chemical properties, and the anode material is lithium metal, which has a very high specific energy. The storage life is long, and the annual average capacity decline is less than 2%. The battery has a semi-sealed design and is completely safe to use. Disposable lithium-manganese button batteries have a wide temperature adaption range and can function normally in temperatures ranging from -20 to +60 degrees Celsius. It's commonly found in electronic dictionaries, motherboard CMOS batteries, and timepieces, among other things.

Secondary lithium

It's a secondary button battery and a rechargeable button battery with a nominal voltage of 3.7V and a charging voltage of 4.2V.

From the rear of the battery, you can see the appropriate mark.


SR---silver oxide--1.55V

CR---Lithium Battery--3V

ZA---Zinc Air--1.4V

LIR---secondary lithium battery--3.7V



The battery offers a high energy density, excellent storage performance, low self-discharge, and long life. The internal resistance of the battery is relatively high, which is a negative. The battery's positive pole is made of raw materials such as manganese dioxide or iron disulfide, the negative pole is a hammer, and the electrolyte is organic matter. The Li/MnO hammer battery has a nominal voltage of 2.8V, whereas the Li(CF)n hammer battery has a nominal voltage of 3V.


Solder pin battery

In Taiwan and Hong Kong, a solder pin battery, also known as a pin battery or a pin battery, is referred to as a PIN battery.

In most cases, button batteries used to store power supplies for small devices, digital products, medical equipment, and other applications must be welded to a circuit board (PCBA). The battery slices are nickel-plated stainless steel strips with a hardness of steel strips. It is difficult to bend. Nickel plating adheres to electronic components and is difficult to remove. Soldering cannot link the battery and the steel strip directly, and the soldering is weak, prone to falling off, and has a narrow contact surface. Soldering is unprofessional for some antique crafts or tiny businesses that require it urgently.


Ⅲ. How to test a Button Battery with a multimeter?

1. Set up the multimeter and the battery to be checked, then plug in the red and black test lines.


2. To turn on the multimeter, press the "Power" button.


3. Select the voltage testing equipment.


4. The positive pole of the battery is linked to the red test wire, and the negative pole is connected to the black test wire.


5. Pay attention to the multimeter's display of power. If it reads 1.2V, the battery is fully charged. If the voltage reads 0V, the battery is dead.


Ⅳ. What happens if a Button Battery is swallowed?

When a coin-sized lithium battery becomes lodged in a child's throat, saliva causes an electric current to flow, causing a chemical reaction that badly burns the esophagus in just two hours. At this point, the youngster may cough, drool, or exhibit discomfort. Therefore, we need to keep the button batteries away from the children. 

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