Battery powered, the output of the battery is pure DC, very clean, the voltage of the battery is neither possible nor high design. The chemical characteristics of the lithium battery determine that the output voltage of a battery can only be around 3.6V, so Many batteries are connected in a three-stage series, and 10.8V has become a very popular battery voltage. Some batteries have a nominal value slightly larger than an integer multiple of 3.6V, such as 3.7V or 11.2V, etc., in order to protect the battery. 2. The switching power adapter is a power supply conversion device for small portable electronic devices and electronic appliances. It is generally composed of a casing, a power transformer and a rectifier circuit. It can be divided into an AC output type and a DC output type according to its output type; It is wall-mounted and desktop. Widely used in telephone handsets, game consoles, language repeaters, walkmans, laptops, cellular phones, etc.

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