How to Replace a Jet Ski Battery

The battery is a key part of starting and running your jet ski, and a dead battery can leave your jet ski undriveable. Your jet ski’s alternator should charge the battery while the engine is running, but if the battery is no longer holding a charge, it may fail to start the next time. If you notice your jet ski clicking but not starting, or if it won’t turn over at all, you could have a failing battery, or other elements of your starting and charging system may be damaged. Avoid a disappointing day on the water by having your jet ski battery tested for free at O’Reilly Auto Parts, and if it needs to be replaced, you can use these instructions and detailed video to better understand how to replace the battery in your jet ski.

Tools & Materials

Safety Eye Glasses Safety Glasses

Protective Gloves Nitrile Gloves 

power torque Phillips Screwdriver Phillips Screwdriver

Power Torque Ratchet and Socket Set Ratchet & Sockets

Super Start PowerSports Battery PowerSports Battery

Schumaker battery maintainer Battery Maintainer

Jet Ski Battery Installation Instructions 

Owning a Jet Ski or a Wave Runner can be a great way to enjoy the water, but like any vehicle, their batteries wear out over time. If it’s clicking and you can’t get it started, or if it won’t turn over at all, it could be the battery. The procedure for changing a jet ski battery can vary quite a bit from one model to the next, so be sure you know the specifics for yours before getting started. If you’re not completely comfortable doing this yourself, we’d be happy to recommend a professional technician in your area.

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Remove the Old Battery

Man turning off jet ski

Step 1: Turn Off the Jet Ski

Make sure the Jet Ski is secure and completely turned off.
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Man removing jet ski seat

Step 2: Remove the Seat

Most batteries jet ski batteries are located under the seat. Remove the seat and detach any cables that may be connected.
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Man with gloves removing the battery hold down

Step 3: Remove the Battery Hold Down

Use a ratchet and socket to disconnect the bolts securing the battery hold down. Once all of the bolts securing it are removed, you can lift out the battery hold do
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Disconnected battery terminal cables

Step 4: Disconnect the Battery Cables

First remove the negative battery cable screw using a Phillips screwdriver. Set the screw aside someplace safe, and make sure the cable isn’t touching metal. Repeat that process with the positive battery cable on the other side.
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Man with gloves removing old jet ski battery

Step 5: Lift Out the Old Battery

Carefully remove the old jet ski battery. Be sure to remove any spacers that may have been used with the old battery.
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Install the New Battery

Man with gloves installing new jet ski battery

Step 6: Install the New Battery

Attach the spacer to the new battery, and then lower it into place in the jet ski.
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Man with gloves reinstalling battery hold-down.

Step 7: Reinstall the Battery Hold-Down

Replace the hold-down bolts on each side, and tighten them until the hold-down and battery are secure.
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Screwdriver tightening battery terminal cables

Step 8: Reinstall the Battery Cables

Reinstall the battery cables starting with the positive, then negative, and the bolts on each side.
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Screwdriver tightening battery terminal cables

Step 9: Reinstall the Seat

Make sure the seat is secure.
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Battery maintainer hanging from jet ski handle

Use a Battery Maintainer

Since your Jet Ski is likely to go long periods of time without being started, keep a battery maintainer on hand and connected during stretches of inactivity so it’s ready to go when you are.
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Additional Resources

How to Get Your Boat Ready for Summer

How to Get Your Boat Ready for Summer
reese trailer hitch being installed

How to Install a Trailer Hitch
man fishing on boat in the water in colder temps

How to Winterize Your Boat

Don’t let a dead jet ski battery ruin your day on the water by replacing a faulty battery at the first signs of decline or damage. Signs that your wave runner's battery is dying or failing to hold a charge include hearing a clicking sound but the engine failing to turn over, or if your jet ski will not start at all and makes no noise when the ignition is engaged. O’Reilly Auto Parts carries a wide selection of replacement parts and tools to maintain your Sea-Doo, including deep cycle marine batteries, motor oil, cleaning and waxing products, and more.

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The automotive repair work depicted in this series is performed under the direction of the manufacturer of the product featured. Prior to undertaking any of the demonstrated repairs on your vehicle, we suggest you consult with a certified mechanic or another professional who can adequately advise you of the proper repair or remedy required. O’Reilly Automotive Stores, Inc. and its affiliates (“O’Reilly”) disclaims any responsibility for injury or damage resulting from a viewer’s attempt to recreate the repairs shown in this series.