Q: What is the routine preventive maintenance program for the battery in your Toyota Sienna?
A: First of all, turn off the engine and disconnect the negative cable before servicing the battery. Inspect the battery for damage or corrosion. If present, clean the battery with a baking soda solution. Inspect and clean the battery carrier and brackets. Reinstall the battery, add felt washers around the terminals, and coat them with petroleum jelly to prevent corrosion. Tighten all clamps and check the battery tray. For charging, use a slow-rate charger. Avoid chargers rated more than 1/10th the battery's amp/hour rating.