Battery replacement is a fairly common routine with owning anything that has a gas engine these days. Just like how your car will need a new battery every so often so will your Jet Ski.
It doesn’t matter if you need a Seadoo Battery, Yamaha Battery, or a Kawasaki Jet Ski Battery, all of them will wear out and need replacing. The question you might have is which one is the best? Which Battery do I need in my Jet Ski? And how much does it cost?
The Best Jet Ski Battery
The best battery you can get for your jet ski is going to be a sealed or AGM Battery. A sealed or AGM battery can handle the abuse a lot better than a regular Lead Acid Battery that you may have gotten in your stock jet ski.
A Sealed or AGM battery doesn’t require any maintenance and with it being able to take the abuse better makes it ideal for watercraft. The way you can tell if it’s sealed or open is by the caps or the lack of them. If you have green, red, yellow, or some colored caps that allow you to add battery acid then that is not a sealed battery.
Since now you know what is the ideal battery to get for your jet ski, you must know figure out what type of jet ski you have. It’s important to get the correct size battery for your jet ski, so let’s talk about that.
Common Question: What voltage is needed to start a jet ski? Most jet skis need 12-volts to start it, but it’s the cranking apps that actually do the starting.
Sea-Doo Battery Size: You have 3 Sea-Doo battery sizes to worry about. The size 16 is for 2-strokes. Size 30 is for most 2015/2016 and below 4-stroke and size 20 for newer Sea-Doos and Spark Models. See update below for more info on this new battery.
Two Types of Jet Ski Battery
When it comes to Jet Ski Batteries there is only two types you need to worry about, 2-stroke and 4-stroke batteries. These are just the names I use to determine what battery a customer would need. This is based off Sea Doo since Sea Doo really only had two types of batteries that they ever used, one for 2-strokes and one for 4-stroke engines. 2016 Update: Sea-Doo now also has a 3rd size that is used in the Sparks and all 2016 and up models that you can get here.
An ETX16L is the “2-stroke” battery and can be found in most, if not all, 2-stroke Jet Skis. It’s the smaller of the two batteries and is more rectangular in shape than the 4-stroke battery. Also, I need to point out that some 4-stroke Yamaha Waverunners and some 4-stroke Kawasaki Jet Ski’s will use this “2-stroke” battery.
An ETX30L is the “4-stroke” battery and is found in all 4-stroke or “4-tec” Seadoo Watercrafts. This battery is more square than the 2-stroke battery and is bigger in size and weight too. This battery has more power and is needed for the newer Jet Skis.
Even though both the ETX16L and the ETX30L are both 12-volt batteries you should never put an ETX16L “2-stroke” battery in an ETX30L “4-stroke” ski. If your Jet Ski requires the “ETX30l’s” then make sure you put the “ETX30L” in them. The reason why I bring this up is that the ETX16L is usually cheaper and it can start the ski but you’ll start to get errors and codes coming up because the ETX16L can’t handle the load that the ETX30L delivers.
If you have a 2014 and up Sea-Doo Spark or a 2016 and up Seadoo Watercraft then you will need this type of battery. This is what the battery looks like…
Keep it Charged!
If you’re replacing your battery every year then you might need to invest in a charging system. Your Jet Ski does not have a charging system like your car does. Instead, your Jet Ski has a Stator that maintains a charge when you ride.
The reason why your battery in your Jet Ski goes bad quicker than your car is because you don’t use your jet ski as often.
When you don’t ride your jet ski the battery starts to sulfate. Not riding for months can cause the batteries plates to sulfate so much that the jet ski won’t start, leading you to need a new battery.
To counteract this you need a battery charger. Battery chargers can be bought here.
A better solution if you don’t have power near you jet ski is to buy a cheap solar panel and just keep it attached to the jet ski’s battery.
You can actually find some solar panel chargers for cheaper than the wall chargers and they work better too! Most Solar Panels are waterproof and modern panels will actually charge when it’s not in direct sunlight.
How To Change a Jet Ski Battery
I’ve created a video below to show you how to change a battery in a Seadoo. This is design for 2011 and up Seadoo’s with some 2009 and 2010 Ski using this design as well.
The tools needed are…
Pro Tip – Pick up some extra Terminal Screws and 13mm bolts. It’s easy to drop them and very hard to get them back.