Tech Tip: How to Maintain a Deep Cycle Battery

how maintain deep cycle marine batteryInspect the Battery for Damage

  • Look for fluid on or around it to determine if it is leaking. Replace any leaky battery.
  • Check for damage and good connections on the terminals, connectors, and cables. Replace any cables with frayed or cracked insulation and tighten any loose connectors.
  • Look for corrosion and clean it off with a warm water/baking-soda mixture. Use 1 lb. of baking soda for every gallon of water. Use a post and clamp cleaner to clean the battery terminals and inside the cable clamps.

Check Electrolyte and Water Levels

  • Check the battery's electrolyte level on a monthly basis (and when you charge it). If you leave the boat plugged in with the converter battery charger charging the battery, check it every 2 months.
  • When checking the electrolyte level, add water by removing the vent caps. Use only distilled or another mineral-free water. If the level is below the plates, fill it just until it covers the plates. Add no extra water until the battery is charged, then fill it no higher than 1/8 inch below the fill well.

Test the Battery's Charge Status

  • check deep cycle marine battery chargeTest the battery's state of charge by measuring the voltage with a digital DC voltmeter. Check the table at the right for required actions. 
  • Use a three-stage charger, if possible, that gives the battery a bulk charge, absorption charge, and then a float charge.
  • Use a charger with a charge rate between 10-13% of your battery's 20-hour AH capacity.
  • Recharge the battery immediately after use. Charge it in a well-ventilated area with no sparks or flames around.
  • Check the electrolyte levels before and after you charge the battery.
  • If you are storing the boat, disconnect the batteries and store them.

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