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There is a world of dry batteries, which are used in television controls, children's toys, lamps, razors or any other type of electrical appliance requiring low power.
Often, some of these devices stop working without knowing that something is wrong or that the battery is exhausted.
Since it is difficult to control the power supply of the battery without voltage, it should be noted simple methods to check the charge of the battery.
In some modern types of high-priced dry batteries ($ 1.5 per battery), an indicator lets you know immediately what's left of the energy.
In this type of battery, there are two points at the negative and negative poles of the battery, with a black bar extending between the two points.
When the two points are pressed simultaneously, a precise indicator appears on the band between them, the red indicates what remains of the battery, as in the video.
But what happens if the battery does not contain such a band? There is a simple way explained by the electrical engineer Lee Hight, published by the website "Life Hacker" specialized home advice.
In this way, to check the battery, the battery can be lifted about one centimeter from a hard surface and dropped vertically. If the battery recharges more than once, its energy is low.
If the battery does not bounce once or stabilize vertically, it remains good and usable. The higher the number of bounces of the battery, the greater the power indicated.
The scientific reason is the formation of dry cells, consisting of a mixture of zinc and carbon, which converts energy by converting the chemical reaction between its components into electrical energy.
This chemical reaction may result in a decrease in the density of the material constituting the battery and thus cause its decline when falling on a hard surface.
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