How To: Replace a Boat Battery

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A battery is crucial to starting and running your boat, and a dead battery could keep your boat from getting out on the water. The alternator charges the battery while the engine is running, but if your boat’s battery is failing, it may not hold a charge and can fail to start the next time. If your boat won’t start or is making a clicking sound and not turning over, your battery could be bad or you may have an issue with other starting and charging components. Help ensure you have a great day on your boat by getting your battery tested for free at O’Reilly Auto Parts before hitting the water. If you need to replace the battery in your boat, check out this video and step-by-step instructions to remove and replace your boat’s battery.

Supplies Needed for This Job:

0:00 Welcome Back
0:41 Locate Your Battery
0:55 Remove the Hold-Down
1:05 Disconnect the Cables
1:23 Install the New Battery
1:37 Reconnect the Cables
1:56 Reinstall the Hold-Down
2:20 Test Your Battery
2:30 Use a Battery Maintainer

Replacing a faulty or failing boat battery can save you from a disappointing day on the water. Signs that the battery in your boat is reaching the end of its service life include hearing a clicking sound but the engine failing to turn over, or if your boat will not start at all and is silent when the ignition is engaged. Find a wide selection of replacement parts and components you need to repair or maintain your boat at O’Reilly Auto Parts, including deep cycle marine batteries, boat accessories, covers, and more.

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Locate and open the battery compartment.
DIR: If your battery has a switch, make sure it is turned “off” until you’re done installing the new battery.

Remove the battery hold-down, and set it aside.

Check the terminals for corrosion and use some terminal cleaner and a rag to gently remove it if you find any.

Now, you’ll use your wrenches to remove the cables from the battery posts, starting with the negative cable. Set the cable aside someplace safe where it can’t touch metal.
Then remove the positive cable, and set it aside.

Once you’re sure all cables are out of the way, carefully lift the old battery out.

Make sure the new battery’s posts are in the right orientation, and lower it into place, making sure it’s seated securely.

Reattach the two cables, starting with the positive cable… then the negative.

If you removed a hold-down, replace it and make sure it’s secure.

Make sure cables are secure inside the compartment… and close the lid.

DIR: If necessary, turn the battery switch back to the “on” position.

Switch on an electronic device to test the battery. If the device works, the battery is properly connected.