Disconnect the negative 
Battery Cable followed by the positive cable from the battery. Check the battery state of charge by visually inspecting the indicator eye on the top; if it appears black, charge the battery. Perform an open voltage circuit test using a digital voltmeter by connecting the black probe to the negative terminal and the red probe to the positive terminal; a fully charged battery should read between 12.6 to 13.2 volts, depending on the outside air temperature. Remove the battery's surface charge by turning on the high beams for ten seconds, then turning them off and allowing the vehicle to stand for two minutes. With the engine and all accessories off, measure the voltage again; it should be 12.6 volts or slightly above. If the voltage is lower, charge the battery before conducting a load test. For the load test, use a battery load tester to evaluate the battery's ability to operate the starter and accessories under heavy amperage draw. Install the load-testing tool onto the terminals and maintain the load for 15 seconds, ensuring the voltage does not drop below 9.6 volts; if the battery is weak or defective, the tool will indicate this. Cold temperatures may cause the minimum voltage reading to drop slightly, so adjust according to the manufacturer's instructions. To replace the battery, disconnect the negative cable first and reconnect it last to avoid shorting. Remove the battery hold-down clamp and lift out the battery carefully, inspecting the battery tray for corrosion. If corrosion is present, detach the bolts and clean the tray to prevent further issues. Ensure the replacement battery matches the original in dimensions, amperage rating, and cold cranking rating, and install it by reversing the removal process.