Fu Nan No.7 battery is an alkaline battery, and its main component is manganese dioxide. It is an ordinary dry battery, which is suitable for different kinds of instruments, equipment and tools. Fu Nan battery No.7 is one of the specifications, belonging to a kind of AAA battery. Although there are many chemical components in battery number seven, generally speaking, when people refer to battery number seven, they usually refer to dry battery number seven.

Fu Nan No.7 battery is also called LR44 battery. Its diameter is11.6mm, its height is 5.4mm, and its weight is about 2.2g. This battery is widely used in small electronic devices, such as watches, calculators, remote controllers, alarm clocks, etc. The battery adopts high-quality alkaline battery technology with long service life and high energy density.