Is there preventative maintenance I can do for my battery?

READ THE SAFETY SECTION

The battery should be examined for cleanliness at regular intervals. Keep cell terminals and connectors free of dust and corrosion. Terminal corrosion may affect the performance of the battery and could present a safety hazard. Should corrosion be observed, disconnect the battery, unbolt and remove the connectors, and remove the corrosion by brushing the terminals and connectors with a dilute solution of baking soda and water (sodium bicarbonate). Reapply an anti-oxidizing grease before reconnecting and bolting the connectors. Always maintain proper records.

DO NOT UNDER ANY CIRCUMSTANCES REMOVE PRESSURE RELIEF VALVES AND NEVER ADD WATER.