AAA battery is the American standard for dry batteries, and Chinese mainland's No.7 battery or Taiwan Province's No.4 battery standard is compatible with it. The battery is cylindrical, with a height of 43.6 mm and a diameter of10.1mm.
AAA battery is a common battery, smaller than AA battery. It is often used in electronic products with small volume and low power consumption, such as MP3 players and small remote controllers. There are disposable alkaline batteries, rechargeable nickel-hydrogen batteries and lithium-ion batteries.
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Characteristics of alkaline batteries:
1, capacity
The capacity of alkaline batteries is higher than that of carbon batteries, because the purity and density of manganese dioxide as cathode are higher, and the internal parts (such as electrodes) are smaller, which also frees up space and helps to increase the capacity, generally 3 to 5 times more than that of carbon batteries. ?
But the capacity of alkaline battery will decrease with the increase of output current. For example, the same battery can have a capacity of 3000mAh at low output current, but when it is used for a negative load with 1A current, the capacity will only be 700mAh, which is less than the original 1/4.
2. Voltage
The electromotive force (e.m.f) of a single alkaline battery, that is, the voltage under no-load is generally 1.5V, but the voltage varies from 1.5V to 1.65V with the difference of manganese dioxide and zinc oxide. When the load is connected, the voltage will decrease with the increase of output current, and the voltage will decrease to about 1. 1V to 1.3V under general load.
3. Current
The output current of alkaline battery is larger than that of carbon battery, but smaller than that of ordinary battery. The larger the capacity of the alkaline battery, the larger the electrode area, and more substances can react at the same time, so it can output more current.
Excessive current will cause the battery to heat up during discharge. Generally, AA batteries can output 700mA current without obvious temperature rise, while larger models of C and D batteries can withstand greater current without obvious temperature rise.
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