Mighty Max 12V 8Ah Rechargeable UPS Battery - Replaces 7Ah 28W BB Battery SH1228W

Ken: I have Mighty Max batteries in my Harley, generator and ups'. They work, have the claimed power, and last a long time.

United States on Nov 06, 2023

Duane Morris: Had two non-usable UPS units and for small investment, both are back and working!

United States on Oct 01, 2023

Thakur H Das: The install for this went great. Didn’t have any issues swapping out my current batteries in my battery backup unit. There was an alarm because of old batteries that would no longer hold charge. These replacements did the trick and are holding up good with a good charge.

United States on Apr 23, 2021

Paul G.: Update July 31, 2019: The batteries and UPS are still going strong but guess what? Another 1350AVR died on me 2 days ago, exact same symptoms. I came here to order another set of replacement batteries to fix the latest dead UPS and figured I’d update my review. You’re welcome! 😁

My CyberPower 1350AVR died...power light started flashing and there was a clicking noise. I found a YouTube video that showed the same problem and exactly how to replace the batteries. Search YouTube for “Replacing or rebuilding the battery pack in a CyberPower 1285AVR UPS”. The 1285AVR looks exactly the same as the 1350AVR. Replacing the two batteries was easy peasy; the UPS is working normally and reports 100% battery capacity. If the batteries die an early death I’ll update my review.

United States on Nov 10, 2018

Evan GEvan G: Update Jan 2021: Finally my first MightMax battery (from Oct 2017) died. Not bad considering a $35 battery pair lasted 3yrs+. Granted, they were mostly running on STANDBY, I never had an extended blackout lasting more than 10 seconds - because I have an automatic whole-house standby generator that comes on after 10 seconds. So while there is a NEWER model (9Ah instead of 8Ah, for $5 more - effectively increasing backup run time by 28% from the original 7Ah battery in my CyberPower 1350VA, CST1300AL), these will do just fine for my purposes.

Top tip: to keep track of things, if you have a label printer, stick on the install date (maybe even model number) of your battery on the outside of the unit so you know from a glance how long it has been since your last battery change.

Also; one thing to keep in mind, over the years, you may see improved battery capacity (the "Ah" rating going up for the same sized battery), but it does not mean it will make your UPS produce higher watts. It will only make it run slightly longer when on battery power.

Updated review Mar 2019: I'm happy to report everything is working fine. Another couple of my CyberPower UPS (1350VA,...

United States on Nov 08, 2017