Why does the car run out of battery after three days?

[VanCaroline]

Reasons for car battery drain: 1. The most likely cause is that the owner forgot to turn off electrical devices in the car after parking. If the owner continues to use high-power electrical equipment such as air conditioning or car audio after parking, since the engine is not working, the battery keeps discharging. As a result, the owner finds the battery dead after three days. 2. Generator malfunction. Broken generator wiring harness or damaged components such as bearings, stator, or rotor cause the car to continuously consume battery power while driving, but the generator fails to recharge the battery, leading to the owner discovering the dead battery later. 3. Natural aging of the battery. Due to prolonged use and reaching the end of its lifespan, the battery's discharge and charging performance deteriorate, resulting in the car experiencing power loss after being parked for three days.