How to Test for Car Battery Drain?

[StHayden]

Methods to check for car battery drain: 1. Inspect whether the battery voltage and charging output are normal, and check for severe corrosion on battery terminals; 2. Remove the negative battery terminal, set the multimeter to maximum current measurement, connect the red probe to the negative cable, and fix the black probe to the battery terminal; 3. Turn off all electrical appliances inside and outside the vehicle, lock the doors, observe the current reading, adjust to the appropriate range, and record; 4. Wait for about 20 minutes until all vehicle modules enter sleep mode, then read the accurate static discharge current. Car batteries, also known as storage batteries, are a type of cell that works by converting chemical energy into electrical energy. Batteries are categorized into conventional lead-acid batteries, dry-charged batteries, and maintenance-free batteries.