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The No. 7 battery is a daily necessity that people often come into contact with. When you replace the battery for various home appliance remote controls, have you noticed that it may just be a No. 7 battery? The simplest way to identify lithium batteries is through their appearance, and the size of the 7th battery also has this recognition function. So, let's start with the size of the 7th battery to understand batteries.

The No. 7 battery is a cylindrical battery, and as we all know, the numerical values representing a cylinder are diameter and height. Undoubtedly, the size of the No. 7 battery is also expressed in terms of diameter and height. According to IEC regulations, the height of a regular No. 7 battery is 44.5mm, while the diameter is 10.5mm.

The most common disposable No. 7 batteries are carbon batteries and alkaline batteries. In the naming standard of IEC (International Electrotechnical Commission), the notation for No. 7 carbon batteries is R03, where R represents circular shape and 03 represents size and model. The notation for alkaline battery number 7 is LR03, where L represents alkaline, R represents circular, and 03 represents size and model.

By the way, the American name for battery number 7 is AAA battery. In Japan, R03 is written as UM-4, LR03 is written as AM-4, while in Taiwan, UM-4 and AM-4 are both referred to as battery number 4. Because these statements represent the same product, the size of the AAA battery is exactly the same as that of the 4th battery and the 7th battery in China. However, when listening to Japanese or Taiwanese people talk about the size parameters of their No. 7 battery, you need to ask them to explain and compare them with American or IEC standards to confirm that it is China's No. 7 battery.

In specific battery manufacturers, the design standards of the manufacturers are not uniform with international standards, and the consistency deviation of batteries from the same manufacturer may also occur. Therefore, domestic manufacturers generally consider the size of the IEC standard No. 7 battery as the largest. In actual production, a range of values for the size of the No. 7 battery is provided, such as a diameter between 9.5mm and 10.5mm, and a height fluctuating between 43.5mm and 44.5mm.

The size of battery No. 7 can also be extended to nickel cadmium batteries and nickel hydrogen batteries in rechargeable batteries. Nickel cadmium batteries have gradually withdrawn from the market due to the harmful effects of cadmium, which are rare to see on the market. But in electronic markets of all sizes, if you see a light green battery that is the same size as a size 7 battery, it is usually a size 7 nickel hydrogen battery.

Due to the small size and capacity of the No. 7 battery, it is suitable for small or small discharge appliances. However, the convenience of the No. 7 battery size makes it popular in the market, providing power for manufacturers to improve the performance of the No. 7 battery.

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