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“Electrical devices or lights left running, a defective charging system or alternator, and extreme weather are some common reasons but maybe it’s just time to get a new battery.”
There could be more than one reason for a car battery to drain. The most common problems however are:
If your vehicle has a battery marked with LOWER and UPPER on its side, you can check the electrolyte level, which should ideally between the LOWER and UPPER mark. Other most common signs of a dying car battery include:
Before Startup
During Startup
During Driving