What are the emergency power sources for cars?

At present, there are mainly two kinds of emergency starting power sources for automobiles on the market, one is lead-acid battery and the other is lithium polymer.

If you just put it in the car as a backup, you don't need to buy a battery. Just buy a car emergency power supply online, which is about the same size and weight as the charging treasure of a mobile phone. You can also charge your mobile phone as a charging treasure. When the car battery is dead, this guy can start the car about 4-5 times.

The standby power supply of ECU refers to the power supply that ECU still has when the automobile ignition switch is turned off. Generally, the ECU has several power sources, one of which is provided by the ignition switch (+15) and the other is directly provided by the battery (+30), which is the so-called standby power source. ?

Principle and function: ECU of modern automobile contains many functions, one of which is the "self-learning" function, which is to constantly correct itself according to the changes of car body (environment).

Such as: ignition timing, throttle position, fuel injection quantity, etc. The read parameters are stored in the RAM inside the ECU. KAM is a random access memory. Once the power is cut off, the data will be lost and the self-learning value mentioned above will be lost. When the vehicle runs again, it takes a long time to learn again. In order to save these learned data, it is necessary to provide backup power for ECU to save the data.