Bringing your car to Boardwalk Ferrari is the simplest way to test your battery. However, there are a few other options that you can do before taking the trip.
Start by looking at it to see if the casing or terminals have any damage. Inspect it for leaks or any signs of corrosion. Next, you can use a multimeter to measure the voltage and other electrical parameters. Use the tool's user's guide to ensure that you are using it properly. Set the tool to the proper voltage range and use the DC setting. Turn off your vehicle and connect the probes to the proper terminals. You should get a reading of around 12.6 to 12.8 volts for a healthy battery.
You can also use a battery load tester according to the instructions in the owner's manual. In general, you will turn off your vehicle and then connect the leads to the corresponding terminals on the battery. Apply the load specified in the user's manual and observe the reading. Under load, your battery should test above the threshold specified.