A battery with a solution of sodium hydroxide and potassium hydroxide as the dielectric. Generally used as a DC power supply for communication, electronic computers, and low-power electronic instruments; It is also suitable for DC power supply of relay protection, circuit breaker opening and closing, and signal circuits in substations and distribution substations. Working principle: Alkaline batteries are batteries that use KOH or NaOH as the electrolyte, mainly including iron nickel, cadmium nickel, zinc silver, cadmium silver, zinc nickel batteries, etc. In alkaline batteries, if nickel hydroxide [Ni (OH) 3] is used as the positive electrode plate and iron (Fe) is used as the negative electrode plate, it is called an iron nickel battery; If cadmium (Cd) is used as the negative electrode plate, it is called a cadmium nickel battery. A cadmium nickel battery consists of a plastic shell, positive and negative plates, a diaphragm, a top cover, an air plug cap, and an electrolyte. Compared with lead-acid batteries, cadmium nickel batteries have stable discharge voltage, small size, long service life, high mechanical strength, convenient maintenance, and small footprint. Currently, they have been gradually promoted and used in small and medium-sized substations. Taking cadmium nickel batteries as an example, the working principle of alkaline batteries is: after charging, the active substance on the battery plate is nickel hydroxide [Ni (OH) 3], and the negative plate is metal cadmium (Cd); When the discharge terminates, the positive electrode plate changes to nickel hydroxide [Ni (OH2)] and the negative electrode plate changes to cadmium hydroxide [Cd (OH) 2]. Potassium hydroxide (KOH) solution is often used as the electrolyte