Views: 0 Author: Site Editor Publish Time: 2022-11-01 Origin: Site
In the field of small batteries, alkaline batteries are very popular and are known and loved by users for their longevity, safety, convenience and low cost. With alkaline batteries, devices can have a longer standby and usage time, and also safety is better guaranteed.
What is the voltage of an alkaline battery?
What is the current of an alkaline battery?
What should we pay attention to when using alkaline batteries?
The electromotive force (EMK) of an alkaline battery is generally about 1.5 V in idle mode. With a brand new, unused battery, the idle voltage can be about 1.65 V. If the battery is used for a longer period of time, the voltage will continue to decrease. If the voltage is below 1.0 V or 0.9 V, you can assume that the battery has failed. When the alkaline battery is connected to the load, the voltage decreases with the increase of the output current, and the voltage often falls to 1.1 V to 1.3 V under general load. The voltage drop of an alkaline battery when connected to a load is due to polarization and internal resistance. In general, the internal resistance of a factory-new AA alkaline battery is about 100 mΩ, and it increases over time.
The output current of alkaline batteries is greater than that of zinc-carbon batteries, but smaller than that of normal batteries. Larger capacity alkaline batteries can emit a higher current because the electrode area is larger and there are more substances that can trigger chemical reactions at the same time. Excessive current causes the battery to accumulate waste heat and heat up during the discharge process. In general, AA batteries can emit a current of 700 mA without heating up significantly. Larger models of C and D batteries can generate less thermal energy without heating up significantly.
1. Electrolyte leakage
In alkaline batteries that have been stored for a longer period of time, electrolyte may leak. Since the electrolyte contains about 30–40% potassium hydroxide, an corrosive alkaline substance, it irritates the eyes, respiratory tract and skin. If it accidentally gets into the eyes, it can cause irritation. The electrolyte can also attack metal and damage electronic parts. Most electronic devices are not corrosion resistant, especially the interior of electronic products.
2. Avoid charging disposable alkaline batteries
Alkaline batteries belong to the category of accumulators, but "disposable alkaline batteries" are not designed for multiple charging cycles. When charging, there is a risk that the battery will break and corrosive electrolyte will leak. For this reason, most manufacturers of "disposable Alkaline batteries" prohibit charging in their safety regulations. For cost reasons, manufacturers do not particularly strengthen the structure of the battery to take into account the charging behavior. Be careful when using them.
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