Marine & Boat Battery Replacement Guide

Replacing Your Marine & Boat Battery

1. Check the type of battery required. Boats will typically have a deep cycle and a starting battery.
2. Locate the current battery.  Open the casing or compartment.
3. Marine batteries usually have nut & bolt terminals. You will need pliers to loosen the connectors.
4. Disconnect negative (black) terminal first, then positive (red) terminal.
5. Remove batteries. These are heavy so ask for help if needed.
6. Insert new batteries. Attach positive (red) terminal, then negative (black) terminal. Use a wrench to ensure connections are snug.
7. Close the battery compartment and replace any other disassembled pieces.
8. Recycle old battery.

Benefit of AJC® Replacement Batteries

• High quality, low cost replacement batteries for thousands of devices.
• Exact OEM replacements guaranteed to fit easily and precisely.
• Backed by easy 30-day returns and a 12-month warranty.
• Over 1,000,000 batteries sold globally.

Marine & Boat Battery Care

• Visually inspect the battery regularly (once per month).
• Clean battery terminals occasionally with baking soda and water solution or a commercially available battery terminal cleaner. Make this part of your routine maintenance schedule. Keeping battery terminals clean will extend the battery life.
• Ensure terminal connections are tight and do not loosen over time. This will help prevent corrosion and unwanted discharge.
• Coat terminal connections with grease or other lubricant to prevent unwanted discharge.
• Ensure the battery is brought up to full charge when not being used. Batteries which fully discharge will have a shorter life and degraded performance.
• Store battery in cool, dry place (68°F/20°C).
• Recycle batteries, do not dispose.

Browse our full collection of Marine & Boat Replacement Batteries