How to Check for Car Battery Drain?

[CorbinDella]

Car battery drain can be checked by following these steps: 1. Turn off the car's ignition switch and wait for 5 to 10 minutes in a locked state to allow the car to enter a dormant mode; 2. Locate the tightening nut on the negative terminal of the battery, loosen it with a wrench, then gently pry open the tightening block with a flat-head screwdriver, and finally remove the negative terminal; 3. Set the multimeter to the DC 10A or 20A range, connect the red probe to the car's grounding wire, and the black probe to the negative terminal of the battery; 4. Observe the reading on the multimeter. If the reading falls within the normal range, it indicates that the car battery is functioning properly.