Most common cause of parasitic battery drain

Have you ever had issues with your car battery? It’s very frustrating when your car doesn’t start and you have places to be. So you ask yourself, what drains a car battery while it is off?

Let’s dive deep into the issue and see what are the common causes of drained battery and how to identify what is draining your battery.

Key Takeaway

• A car battery is a rechargeable device, typically lead-acid type, that provides electrical energy to start the engine and power the electrical systems in a vehicle when the engine is not running.
• A car battery can be drained while it is off due to factors like interior lights left on, faulty wiring, bad fuses, corroded alternator diode, electrical glitches, ineffective charging, and parasitic power loss from devices such as the clock, radio, and alarm system.
• Signs of a dying car battery can include a “check engine” light on the dashboard, slow engine crank, ignition clicks, dim headlights, general electrical problems, difficulty starting the car, a swollen battery size, an odd smell from the battery, and poor p
  why is my car battery draining when the car is off
  battery keeps draining overnight