To check your battery health, you need to use a voltmeter. Start by removing the protective covers from the terminals of the battery. Now, attach the positive lead (red wire) of the voltmeter to the positive terminal. Next, attach the negative lead (black wire) of the voltmeter to the battery’s negative terminal. After completing these connections, take note of the readings showing on the voltmeter. A healthy battery typically has a voltage between 12.4V and 12.7V.