Rated 4.89 out of 5 based on 19 customer ratings
(19 customer reviews)

$24.99

12V 9AH Replacement Battery for CyberPower RB1290 UPS

SKU: ML9-1294286B Category:
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$ 24.99
$ 44.99
$ 199.99
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: F2
Battery Dimensions: 
5.94 in x 2.56 in x 4.02 in
Weight: 5.10 Lbs
Warranty
1 Year
Multi Packs Bundled Savings

1 Pack, 2 Pack, 10 Pack

19 reviews for 12V 9AH Replacement Battery for CyberPower RB1290 UPS

  1. Rated 5 out of 5

    M. Kauffman

    This is a plug in replacement for the battery in my UPS. Less than half of what the OEM wanted.

  2. Rated 5 out of 5

    Stephen D. Ward

    When I originally installed AT&T internet, it came with a small UPS back-up battery. This battery is exactly the one I needed to replace the original. Installs easily and works great.

  3. Rated 5 out of 5

    anthony

    It was listed as fit for a dr chipper but it was smaller than the original but even though it was smaller it works fine

  4. Rated 5 out of 5

    roy m painter

    It was what I needed and works good

  5. Rated 4 out of 5

    Fred E.

    I got this to replace the battery in my Monster Rocking Roller Speaker, it was a fight to get it back in but it does work.

  6. Rated 5 out of 5

    baker

    I was going to throw my speakers away until I saw that I could get a battery. I ordered 2 and they work better than ever expected!!

  7. Rated 4 out of 5

    Ted T

    good battery but had to wrestle with putting it in my cyberpower computer back up. Leads are backwards

  8. Rated 5 out of 5

    CaptainSportster

    Used to replace a very weak battery in my CyberPower UPS backup. Easy installation. Seems to be working fine. Cannot rate Longevity due to that fact the battery has been installed only a couple of weeks.

  9. Rated 5 out of 5

    Howgold

    The Mighty Max 12V9AH battery is the exact replacement battery for the CyberPower RB1290 battery. And it’s less expensive.

  10. Rated 5 out of 5

    Ilene, the Folks dancer.

    This battery was for the Folks dancers, music system, out in the open space for everyone to enjoy. Where there is no power system available.

  11. Rated 5 out of 5

    Jeremy Noble

    Exactly what I needed.

  12. Rated 5 out of 5

    Garth Luer

    Nothing

  13. Rated 5 out of 5

    Modoc Organ Gig

    Easy to install and was fully charged. My Cyberpower UPS worked perfectly with the replacement battery. The original battery lasted 10 years

  14. Rated 5 out of 5

    Anthony J. Fasy

    Easy to install, lasts a long time, no issues.

  15. Rated 5 out of 5

    JetFan

    Bought 2 of them and it works fine.

  16. Rated 5 out of 5

    J. Sekula

    Worked well for my Cyberpower CP1000PFCLCD. I had to bend the negative terminal a bit to match the angle, and crimp the connector a bit.

  17. Rated 5 out of 5

    Mark Simmons

    Dropped this into a CyberPower CP1000AVRLCD I bought ten years ago to handle a load fault issue, and the problem just went away entirely. Like a brand new unit. Thrilled.

  18. Rated 5 out of 5

    DiosmayaTop Contributor: Woodworking

    Worked perfectly for my UPS, plugged it in and it worked as it is supposed to. It’s been only two weeks, no problems so far. It is more than a year and it keeps working like a charm, perfect battery.

  19. Rated 5 out of 5

    Diosmaya

    Worked perfectly for my UPS, plugged it in and it worked as it is supposed to. It’s been only two weeks, no problems so far.It is more than a year and it keeps working like a charm, perfect battery.

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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