What is the button cell number of the stopwatch on the through train?

The button cell of the watch on the bicycle is usually number 5.

The so-called button cell, also known as button cell, is named after its shape like a small button. Generally speaking, button cell has a larger diameter, but its thickness is inversely proportional to it, so it is lighter. Therefore, from this point of view, button cell has completely different characteristics from other batteries in appearance, and correspondingly there are columnar batteries and square batteries. Many manufacturers also produce irregular batteries from time to time to meet the needs of different environments.

There are two kinds of button cell: rechargeable and non-rechargeable. Rechargeable button batteries are mainly lithium-ion button batteries, while non-rechargeable button batteries are classified into lithium-manganese button batteries and alkaline zinc-manganese button batteries.

Button cell's application mode: button cell has a wide range of applications in the field of electronic digital because of its petite appearance, such as our common computer motherboards and electronic watches, as well as electronic scales that are often used in our lives and isolated electric toys used by children. Friends who like photography should be familiar with their camera batteries. Yes, it is also a kind of button cell.