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How Long Does It Take to Charge a Dead Jet Ski Battery? 

 September 19, 2021

By  Phil Borges

Jet skis are very exciting water vehicles that can make you feel a rush of adrenaline. But if you are serious about it and own a jet ski, there are a few maintenance aspects that you cannot skip. Today, we look at what it takes to charge a dead battery and how to avoid that in the future.

If the battery of your jet ski is completely dead, it is likely to take about an hour to reach about 65 percent of its maximum capacity. If you want a fully charged battery, you are going to have to wait for at least a couple of hours. And while it is charging, make sure you stick around and check the progress every half an hour so that you don’t overcharge it accidentally.

Apart from just how to charge the jet ski battery, we will also look at the risks involved if you don’t charge your jet ski battery carefully. All of that and more in a minute. Keep reading.

How to Charge a Dead Jet Ski Battery

Before you start the process, make sure the battery is in a dry place. If it comes into contact with water while you are charging it, you will be in so much trouble.

  1. 1Remove the battery from the jet ski and get it near a power outlet.
  2. 2
    Using a screwdriver, take out the panels and covers that are surrounding the battery. You might have to start the process by removing the passenger seat because usually, that’s where the battery is (especially if you have a Kawasaki or Yamaha jet ski). Check the owner’s manual to be sure.
  3. 3
    Disconnect the black cable from the battery before you proceed so that you don’t spoil the jet ski’s computer.
  4. 4Connect the charger to the battery and make sure it is in the read-out mode which indicates that it is good for usage.
  5. 5Now connect the red cable of the battery charger to the positive terminal of the battery. It will be marked with a + sign.
  6. 6
    Connect the black cable from the battery charger to the negative terminal of the battery which is marked by a - sign.
  7. 7
    Check to see if the battery is charging. Typically, chargers come with a light or some other sort of indicator to help you out here.
  8. 8
    When it is done charging, start by removing the black cable from the negative terminal first. Then do the same with the red cable and the positive terminal of the battery. This order is very important.
  9. 9
    If you have a smart charger, it will tell you when the battery is fully charged. You can check this by seeing if the LED light turned green or solid. If it is still blinking or showing red it is possible that something is wrong with the battery or the charger.

Otherwise, you have successfully charged your jet ski.

Jet Ski Battery Dead After Winter

It is not going to be jet ski season all through the year. So, it is important for you to understand the role of charging for those winter months when your prized possession is going to stay locked up in your basement.

One of the most recommended methods of maintenance for jet skis is that you keep the battery charged or remove it from the body of the jet ski. If not, your battery is likely to die.

And in those situations, it doesn’t help if you try to take it out even if preparation for the summer. That just does not work and yet a lot of people try it. They just realize that the jet ski’s engine does not start. So, it ends up being a wasted trip.

If your jet ski does not have a solar panel or if you failed to charge it at home, it will be dead by the winter. Guaranteed. That’s because of both the lack of charge and the cold weather.

Now, if you have left the jet ski unattended for about three years or more, it might be time to replace the battery. If it has been dead for that long, it is highly unlikely for you to revive it. And in that case, you might also want to get and place the battery closer to jet ski season so that you don’t end up making the same mistake with a new battery.

Now, unlike a car battery which needs to be changed once every few years, the battery of your jet ski does not last that long because you drive your car all the time but a jet ski is a seasonal vehicle. This means that it is more than likely that the plates of the battery are covered in lead sulfate crystals. This process is called sulfation and it causes the battery to lose its charge over a period of time.

And compared to your car, it happens sooner with a jet ski battery because it is smaller and is driven a lot less often.

How to Tell If Jet Ski Battery Is Dead

This is quite simple. When you put your keys in and try to turn the engine on if all you hear are clicks. If you hear only one click, that means you have a bad starter relay. You might even be able to spot a warning from the watercraft saying “12 volt low”. That means the battery might not be entirely dead but it is weak. You can also tell that the battery is weak if the jet ski hardly moves no matter what you do.

Frequently Asked Questions

Why Does My Jet Ski Battery Keep Dying?

This one is not hard to figure out because there are some classic tell-tale signs.

First, because you are not using it enough. And while that is understandable, keeping your jet ski in storage for long periods of time causes damage to the battery. It undergoes sulfation which will cause a build of sulphuric acid or lead sulfate crystals on the plates of the battery. That causes the battery to dull down.

Second, it is possible that when you are charging the battery, you leave it on for too long even after it is charged. If you don’t have a smart charger that can detect full charge and automatically switch off, your battery is getting overcharged and that causes damage.

Over time, the battery doesn’t reach 100 percent charge like it used to happen with laptops a while back. This is also hazardous because overcharging has reportedly caused accidents in the form of small explosions.

Third, you probably did not store the battery for winter. This means you kept the jet ski in the garage during the winter months and left the battery inside. Ideally, you should remove it and store it in a place that is not so cold. Charge it with a solar panel or a trickle charger so that it does not die.

Fourth, you might have a bad battery. You can figure this out if you have been facing problems right from the beginning. To avoid this, you must do some research on your own about the best kind of batteries for your jet ski. Of course, sometimes it is just a matter of luck.

How Do You Check a Jet Ski Battery?

First of all, get the jet ski out of the water and turn it on. Check the battery’s voltage by plugging in a voltmeter if required. If it is not near 14 volts, then it is in trouble. If it is less than 12 volts, then there is something wrong with the charger or the battery.

About the author

Hi, I'm Phil Borges.. thanks for reading.. My wife says I can't shut up about batteries so to save my marriage I've started this blog .. where I'd be ranting about batteries! Please leave a comment if you have any questions, I'm happy to help!

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