Rated 4.95 out of 5 based on 20 customer ratings
(20 customer reviews)

$29.99

YTX9-BS Replacement for 2003-06 Kawasaki KSF400A (KFX400) ATV Battery

Availability: In stock

SKU: YTX9-BS75 Category:
This YTX9-BS is a sealed lead-acid (SLA) absorbed glass mat (AGM) rechargeable battery. AGM and GEL batteries are lead-acid and of the same battery chemistry. This battery comes already charged, sealed, maintenance free, and ready to install.
Premium quality absorbed glass mat technology (AGM) is ideal for ATVs, Motorcycles, Personal Watercraft, Jet Ski’s, Snowmobiles and more.
Specifications of the YTX9-BS Battery
Voltage: 12 Volt
Amperage: 8 AH
Chemistry: SLA, AGM
Terminal: Nut & Bolt 
Battery Dimensions: 
5.90 in x 3.38 in x 4.25 in
Weight: 6.72 Lbs
Warranty
1 Year
Weight

6.72 Lbs

Width

3.38

Polarity

+ I –

Volts

12V

Height

4.25

Length

5.90

Chemistry

SLA / AGM

CCA

135

Amp Hour

8Ah

Warranty

1 Year

20 reviews for YTX9-BS Replacement for 2003-06 Kawasaki KSF400A (KFX400) ATV Battery

  1. Rated 4 out of 5

    Chuki5

    Overall I am Content the only reason why I did not give a 5 star rating is because the battery is actually much smaller than the battery it replaced.. It starts up my ATV just fine and that’s all that I needed.

  2. Rated 5 out of 5

    Josh Macklem

    Perfect match up for a 2005 Kawasaki kfx400… terminal screws could be an eighth of an inch longer but oh well

  3. Rated 5 out of 5

    Sarah Swisher

    I bought this battery for one of our ATVs 5 months ago and it’s still working just fine. I’ve bought these Mighty Max batteries for our other ATVs and jet skis and they have all served me well.

  4. Rated 5 out of 5

    Sarah Swisher

    I bought this battery for one of our ATVs 5 months ago and it’s still working just fine. I’ve bought these Mighty Max batteries for our other ATVs and jet skis and they have all served me well.

  5. Rated 5 out of 5

    Jamie F.

    Fit a 2003 Kawasaki kfx 400 atv perfect. Plug and play. Already charged out of the box

  6. Rated 5 out of 5

    David

    purchased battery from seller before, still working. bought this knowing it would work. fit and put right to work no problem.

  7. Rated 5 out of 5

    David

    purchased battery from seller before, still working. bought this knowing it would work. fit and put right to work no problem.

  8. Rated 5 out of 5

    Daniel Francis

    Exact size and output as factory model. Works perfectly.

  9. Rated 5 out of 5

    James V.H.

    Had a dead batter in a 4-wheeler. Ordered this Mighty Max Battery, it fit perfectly and works like a charm. Very strong, very happy with it.

  10. Rated 5 out of 5

    robert reuter

    nice

  11. Rated 5 out of 5

    robert reuter

    nice

  12. Rated 5 out of 5

    Consumer

    This fit and worked perfectly in my 20016 Kawasaki 400 KFX Quad. It worked so well I bought another one.

  13. Rated 5 out of 5

    Jm

    Worked great, would purchase again.

  14. Rated 5 out of 5

    Randy

    They came charged. They were a perfect fit and came the needed hardware. Excellent price and worked great.

  15. Rated 5 out of 5

    Web Customer

    Nice product

  16. Rated 5 out of 5

    Customer

    Nice product

  17. Rated 5 out of 5

    Avner Davidian

    excellent battery !

  18. Rated 5 out of 5

    Gary P.

    very good battery for the money excellent price

  19. Rated 5 out of 5

    Lloyd Parks

    Battery fit and preformed perfectly…Good product.

  20. Rated 5 out of 5

    Ken Moniere

    Right battery for the right price

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Excellent
Mighty Max Battery
Based on 3470 reviews
Battery arrived in a good shape package strait to my door steps
Arrived just in time to power my generator here in the cold Maine winters. Excellent service!
Arrived quickly from WALMART.COM. Perfect size and proper placement in my generator. Installation was easy. Generator fired right up. Battery came fully charged.
New battery. Ready for cold weather!
So far these Might Max batteries are good but it’s only the first day and they were on charge for 12 hrs. I’ll have to come back and do an update at some point in time. Ordered them on Amazon and got them the next day. I was encouraged by Mighty Max to make this google review and post pictures to extend my warranty for 3 months but there is no way to post pictures 🤣🤣🤣 It’s been a few months and I was able to go back and edit, so here is a video I made, the rest of the photos I have deleted. Batteries are still going strong. Update 12-11-2025
They arrived within 2 days of ordering them packaging was really good I haven't put them in my MX350 yet I hit them with my multi meter fresh out of the box and got 12.4v on both batteries so that is good
Fonctionne bien et s’est bien adaptée pour le remplacement de l’ancienne.
Battery arrived in perfect condition and 100% charge.
Strong battery! It spins my 24 hp Kohler engine super fast!
Arrived fully charged..great price