When the engine of a car or truck is started, the battery of the car needs to provide 12 volts. When the battery cannot be used, the car cannot be started. At this time, an emergency power supply can be used to replace the car’s own battery to start the car.
The emergency power supply can also have many other rich functions and become an emergency power supply in a broader sense. For example, it can charge mobile phones and other electrical appliances, can be used as lighting, and can provide power for laptops; with an air pump, it can also pump up tires. ; With inverter can also output 220 volts to supply power to other electrical appliances.
　　 When choosing a product, you should pay attention to that a good emergency power supply must be easy to maintain, even without maintenance. The battery has a long life and can adapt to harsh working conditions. For example, some products can work normally within a large temperature range. In addition, it depends on whether the function meets the demand and whether it is convenient to use.