Traditional Culture Encyclopedia - Traditional stories - Why did the old radio use the No.9 battery?
Why did the old radio use the No.9 battery?
Market demand.
Battery production is also suitable for all kinds of electrical appliances, and conversely, the design of electrical appliances is based on the relationship between supply and demand in the market.
Battery No.9 is also called AAAA battery. Similarly, for example, the No.5 battery is called AA, and the No.7 battery is called AAA. Battery 9 is smaller and shorter than battery 7. The anode and cathode are at both ends, and the appearance is cylindrical.
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