How to Solve Car Battery Drainage?
2 Answers
Open the engine compartment hood, use a wrench to loosen the fixing nut on the negative terminal of the battery, then pry open the fastening block with a flat-head screwdriver and pull out the negative terminal connector. Set the multimeter to DC 10A, touch the red probe to the car body's grounding part, and the black probe to the negative terminal connector of the battery. Observe the value displayed on the multimeter. If it exceeds 0.05, it indicates significant battery drainage in the car. For circuit repairs, it is best to have professional maintenance personnel handle the issue.
Car battery drain refers to the situation where the battery is depleted after the engine is turned off, making it unable to start the car. I've encountered this issue many times. The most common cause is forgetting to turn off certain devices, such as the reading light or rearview mirror heater. My usual approach is to first turn off all devices, lock the car, and wait a few minutes to see if the issue persists. If the problem remains, it might be an electrical circuit issue—check the fuses and battery terminals, and clean any corroded parts with a damp cloth. An aging battery is also prone to leakage; testing the voltage or simply replacing it can solve the problem. For prevention, minimize installing additional electronic devices, and have the wiring inspected regularly by professionals to avoid short circuits or aging issues. If you prefer DIY solutions, buy a simple multimeter to measure the current after the engine is off—if it exceeds 50 milliamps, a thorough inspection is needed. In any case, timely action is essential to avoid unnecessary trouble.
