Which is bigger, number 5 or number 7?

In terms of size, the No. 5 battery is larger than the No. 7 Battery. In general, the length of the No. 5 Battery is about 50mm, and the diameter is about 15mm. The length of the No. 7 Battery is about 45mm, and the diameter is about 10mm. On the package, No. 5 battery will be labeled AA, No. 7 battery will be labeled AAA, due to the size of the reasons, the capacity of the No. 5 battery than the No. 7 Battery. According to the classification, No. 5 Battery and No. 7 battery can be divided into zinc-manganese battery, alkaline battery, rechargeable battery, the price also varies, users can choose according to needs.

Points to note when using batteries:

1. Don't throw away the battery after it's used. Clean it up. Don't charge a battery if it's not a rechargeable battery. Take the battery out if you haven't used it for a long time. 4. Don't disassemble the battery. Don't heat the battery. 6. Pay attention to the positive and negative electrodes when installing the battery.

A dry cell is a volt cell that uses an absorbent, such as wood chips or gelatin, to make the contents into a paste that does not spill. Often used as a flashlight lighting, radio, and other power supply. The dry battery belongs to the primary battery in the chemical power supply, and is a kind of disposable battery. The chemical power supply is called a dry cell because its electrolyte is a non-mobile paste.