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 4145 reviews
These batteries were purchased for a razor motorcycle. They work wonderful and were easy to install! Our little man is happy to be back riding
Perfect fit and ready to go.
Arrived in perfect condition
2011 Yamaha Raptor 700R battery, started right up. Has a 1 year warranty. Great deal.
Love mighty max batteries
Arrived well packaged. No information as to original warranty coverage and term, but lots of solicitations to extend the warranty coverage for a whole amazing 90 days - Wow, such product confidence! At least it’s not made in China, but is Thailand any better for quality manufacturing? We’ll see.
Ktm duke 390
Arrived next day and sas very easy to install. They also offer free 3 warrany extension.
I ordered this MightyMax battery through Amazon. The Ad states it works in my GE Simon XT house alarm.
I received my battery from Amazon on March 9, 2026. The box was a little squashed but the battery was packaged well and it it fine. I installed it and finally my gate opener is working properly. I purchased 2 batteries before this and had to return them because they were the wrong battery. This one is working great.