my Honda Accord 10th Generation (2018-2022) battery dies after a few days what could be wrong

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, and cleaning supplies.
• Disconnect the negative battery terminal to ensure safety during inspection.

2. Inspect Battery and Connections

• Sub-step 1: Remove the battery terminals (negative first, then positive).
• Sub-step 2: Clean the terminals and battery posts with a wire brush.
• Sub-step 3: Inspect the battery for any signs of swelling or leaks; replace if necessary.

3. Perform Parasitic Draw Test

• Sub-step 1: Reconnect the negative terminal and set your multimeter to the DC amperage setting.
• Sub-step 2: Disconnect the negative battery terminal again and connect the multimeter in series between the battery and the terminal.
• Sub-step 3: Monitor the reading; it should be below 50mA. If it’s higher, systematically remove fuses to find the offending circuit.

4. Check Alternator Functionality

• Sub-step 1: Reconnect the battery and start the engine.
• Sub-step 2: Use the multimeter to check the voltage at the battery terminals; it should read between 13.8V and 14.5V.
• Sub-step 3: If the voltage is below this range, the alternator may need replacement.

5. Replace Components as Necessary

• Replace any faulty battery, corroded terminals, or malfunctioning alternator as identified in previous steps.