What are the reasons why jump-starting still cannot start the car?

[SanKai]

The reasons why jump-starting still cannot start the car include long-term vehicle inactivity, excessively thin jumper cables, battery damage, and failure to maintain the engine-off state. Below are some explanations for why a car battery still cannot start after jump-starting: 1. Long-term vehicle inactivity: If the vehicle has been parked for an extended period without use, the battery naturally discharges, leading to a dead battery and the inability to start the car. 2. Excessively thin jumper cables: Jumper cables that are too thin result in insufficient current. Improper operation during jump-starting, such as loose or improperly connected clamps, or the rescue vehicle not being started, can cause insufficient voltage and current. 3. Battery damage: The vehicle's battery itself may have been deeply discharged multiple times and can no longer hold a charge, indicating severe damage. 4. Failure to maintain the engine-off state: Both the vehicle and the rescue vehicle used for jump-starting must remain in the engine-off state.