Rated 4.86 out of 5 based on 7 customer ratings
(7 customer reviews)

$28.99

12V 9AH Battery Replacement for Generac XG8000 Portable Generators

Availability: In stock

SKU: ML9-12NB15 Category:
Delivering power when you need it, the Mighty Max ML9-12 12 Volt 9 AH uses a state of the art, heavy-duty, calcium-alloy grid that provides exceptional performance and service life in both float and cyclic applications.
The ML9-12 is an Absorbent Glass Mat (AGM) technology with a valve regulated design, that can be used in enclosed and indoor environments without leaking or maintenance, providing a superior performance for thousands of models.
Mighty Max SLA batteries are utilized in a wide variety of applications including; Consumer Electronics, Electric Vehicles, Engine Starters, Golf Carts, Hunting, Lawn and Garden Tools, Medical Mobility, Motorcycles, Power sports, Portable Tools, Solar, Toys and Hobby, Access Control Devices, Emergency Lighting, Security and more.
Specifications: 
Voltage: 12 Volt
Amperage: 9 AH
Chemistry: SLA, AGM
Terminal: Nut and Bolt
Battery Dimensions: 
5.94 in x 2.56 in x 3.94 in
Weight: 5.17 Lbs
Warranty
1 Year
Volts

12V

Amp Hour

9Ah

Chemistry

SLA / AGM

Terminal

Nut and Bolt

Quantity

1

Length

5.94

Width

2.56

Height

3.94

Weight

5.17 Lbs

Warranty

1 Year

7 reviews for 12V 9AH Battery Replacement for Generac XG8000 Portable Generators

  1. Rated 5 out of 5

    Martin Murdoch (verified owner)

    Did exactly what it was supposed to do. Switched battery, charged overnight and generator that had not run for a year fired up like a charm. Thanks.

  2. Rated 5 out of 5

    Wing G. Chung

    The Battery is an exact replacement for what fits into a portable air pump and jump started pac. The only thing I can point out is the terminals are facing 90 degrees from the original battery in my jump starter. I had knew the cables to the new battery would be no problem. So be aware of ter battery terminal positions.

  3. Rated 5 out of 5

    Skybird

    Works great for my GenerAC

  4. Rated 5 out of 5

    Al Lopez

    Easy to install, powerful unit.

  5. Rated 5 out of 5

    William Sparks

    Worked great had no problems

  6. Rated 5 out of 5

    RAUL L.

    I HAVE AN ` STANLEY FAXMAX 350 AMPS ` THE BATTERY WENT BAD MONTHS AGO, FINALY I TOOK OLMOS 2 HRSTO OPEN AND REMOVED THE BATTERY AND ORDER FROM , BATTERY CAME PUT IT BACK AND!!!! EURICA MYCHARGER IS WORKING GREAT, THANK YOU TO THE Mighty Max Battery 12V 9AH Battery FROM

  7. Rated 4 out of 5

    Bob Cox

    Seems good

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Excellent
Mighty Max Battery
Based on 3474 reviews
Arrived quickly. Even got a sticker with it.
Solid looking battery, came well packaged. Have used their battery before for my lawnmower and now looking forward to see how it lasts in my snowmobile.
I can't believe it less than 48hrs since I ordered from Walmart and it's in the machine. What more can I say except great price.
Thanks Larry
Item as described and perfect fit and arrived on time
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