1. Test the battery to see if the voltage can reach more than 10v, if not, it means that it is time to change the battery.
2. If the battery is qualified, check the resistance of the ignition wire. If the resistance exceeds the threshold, use a new wire. You can find a professional to detect the ignition waveform to see if the ignition energy is enough, and you can consider improving the ignition system.
3. Check the electrical appliances for leakage. Many places of electrical equipment may be in poor contact and other problems, need to tighten and other operations.
4. If the car is placed for a long time, it is best to remove the negative electrode of the battery. Because many electrical devices are not controlled by the ignition key, many devices have been powered by batteries regardless of whether they drive or not. That's all I can think of for now.
The reasons for this situation in electric vehicles are usually, one is that the battery terminal oxidation or poor contact. Cause small current, can not afford to take.
Second, the battery is not working, need to add water or replace.