The Best Jet Ski Battery + What Size You Need

Jet ski batteries don’t last forever but buying the correct jet ski battery can help extend their life.

It doesn’t matter if you need a Seadoo Battery, Yamaha Battery, or a Kawasaki Jet Ski Battery; I’ll show you what I consider the best and which ones you’ll need for your jetski.

What you’ll learn:

  • What is the best jet ski battery?
  • What battery fits your jet ski?
  • How to keep your jet ski battery from dying every year.
  • Common questions people have about jet ski batteries.
  • And how to change your jet ski battery.

The Best Jet Ski Battery

The best jet ski battery is a ETX16L, ETX20L, or ETX30L, depending on what size you need.

What Size Yamaha Battery To Buy

If you have a Yamaha jet ski, you need a Size 16L Battery (Amazon Link Ad).

ETX16L is what I recommend, but you can often find these part numbers that work for it too… ET16L, B2317RP, UT16L-B, UB16L-B

What Size Kawasaki Battery To Buy

If you have a Kawasaki jet ski, you need a Size 20L battery (Amazon Link Ad).

ETX20L is what I recommend but these other part numbers will work too… MBTX20U, UTX20HL, UTX20HL-BS, B2015, YTX20HL, MBTX20UHD, DURAGM-20L

What Size Sea-Doo Battery To Buy

  • Before 2002, needs a Size 16L.
  • 2002 to 2007 2-Stroke needs a Size 16L.
  • 2002 to 2007 4-Stroke needs a Size 30L.
  • 2008 to 2015 needs a Size 30L.
  • 2014 and up Spark needs Size 20L.
  • 2016 and up Sea-Doo need a Size 20L.

Get the batteries here:

Note: The ETX30L is a sealed battery that is shorter than the unsealed one, so a spacer is needed and should come with the battery.

  • ETX16L is what I recommend but these part numbers will work… ET16L, B2317RP, UT16L-B, UB16L-B
  • ETX20L is what I recommend but these part numbers will work… MBTX20U, UTX20HL, UTX20HL-BS, B2015, YTX20HL, MBTX20UHD, DURAGM-20L
  • ETX30L is what I recommend but these part numbers will work…UIX30L, B3121, MBTX30U, YIX30L

How To Tell If You Have a 2-Stoke or a 4-Stroke

How can you tell if you have a 2-stroke or a 4-stroke jet ski? Look for the dipstick on the top of the engine. It’s either a yellow or red dipstick cap located at the top of the engine, as shown below.

Point to the dip stick on a PWC

If you have a dipstick, you have a 4-Stroke jet ski. If you have a Sea-Doo made on or after 2008, then it’s for sure a 4-Stroke.

How To Find The Age Of Your Jet Ski?

To find what year your jet ski was manufactured is easy for boats and jet skis.

On the back of your jet ski, you will have your VIN. It’s most often on the upper side of the rub rail, but older jet skis it will be under.

The VIN last two digits tell you the year it was manufactured.

VIN placard on the rear of jet skis
VIN example with white background

Using the images above, we can see it ends in D212, so it’s a 2012 model. E414 would be a 2014 model, and a J220 would be a 2020 model.

How To Make Your Battery Last?

If you’re not keeping your jet ski battery on charge when you’re not using it for over a month, the battery will only last one riding season.

Keeping your jet ski battery on a charge is super easy to do with solar panel chargers (Amazon Link Ad). They’re quite affordable and far easier to deal with than wall chargers.

I go over how to use them and where to get solar chargers here.

When I’m not riding my jet ski, I use the quick connect and hook up the solar charger. Doing this, I have gotten over 5 years out of my sealed battery. I got my Spark in 2014 and did not change the battery until summer 2020.

What if a solar charger won’t work? If a solar charger won’t work, I recommend getting a wall charger. You’ll want a smart battery charger like this here (Amazon Link Ad), so it won’t overcharge the battery. The battery charger needs to be 12 volts and less than 2 amps.

Should You Install A Battery Switch On Your Jet Ski?

No, do not install a battery switch on your jet ski.

I’ve had a few people do this, and it never works out.

The problem is not that the jet ski consumes a little bit of power when you’re not using it, but the fact that naturally lead-acid batteries sulfate and die when they’re not used.

This is why I love solar chargers. The solar charger does charge the battery (very slowly) but what it does better is maintain the battery. It maintains the battery by keeping it active, which keeps it from sulfating and dying. The solar charger is basically “tickling” the battery instead of letting it sit and do nothing, which kills it.

What Voltage Are Jet Ski Batteries?

All jet skis use a 12-volt battery.

You also must charge the jet ski battery at 12 volts. Do not charge beyond 2 amps when charging a jet ski battery. This means a new battery will need several hours to charge.

My Jet Ski Clicks?

If your jet ski gives one click, then it’s a bad starter relay.

If your jet ski gives multiple clicks, then it’s a bad battery.

To fix this, I have a guide here.

How To Change A Jet Ski Battery?

The most common tools you’ll need to change a jet ski battery are…

  • 10mm wrench and socket
  • 13mm socket
  • Phillips head screwdriver
  • 12in extension

Here are videos showing you how to change batteries in jet skis.

Sea-Doo Battery Replacement Video

Yamaha Battery Replacement Video

Kawasaki Battery Replacement Video

47 thoughts on “The Best Jet Ski Battery + What Size You Need”

  1. I have a 09 Yamaha vx 110 is a small lawn mower battery that has 350 cca to much I understand it is slightly bigger in size but I made a tray for it to fit will it harm the electronics or affect the charging system the old battery had 260 cca

  2. Hi and thanks for all the great info you provide. I have 2006 Honda Aquatrax F 12. Just turned 100 hrs. I have been trolling w it and 2 times the battery has not started after trolling 2-3 hrs. Luckily I carry small rechargeable jumper that fires it right up while I’m out there. Is it normal the battery will drain at idle in 2-4 hrs? after going straight in at full 3/4 throttle after dead battery it fires Rt up once back at dock. Battery reads 14.7 at idle on tester. Going to replace the battery. So main questions are: 1)do Honda’s drain battery at idle
    2) what battery do you recommend for Aquatrax?
    3) what do you think of Yuasa batteries for skis?
    Thank you

    • It should not drain while running at idle. Your stator or rectifier could be going bad. I recommend a sealed lead acid battery like the ETX20L.


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