SUA1500 Batterys Don't Recognize Full Runtime

[Anonymous user]

Over the years I've replaced the OEM batteries in my SUA1500 units with generic ones purchased from a variety of sources. Normally it hasn't been a problem but this time around I needed to change the cells on one that's giving me a particularly hard time: the one on my personal workstation. I bought four cells (enough for two batteries), and immediately found that both only had 2-4 minutes of runtime under a 40% load. I tried the trick that most folks talk about on here about yanking the power under a non-critical load (I used a spaceheater on low, got me to ~45%), and it lasted a little longer, but the time on both of the batteries that I cooked up were no good. I figured that my UPS may have taken a dive, so I got another (at work we have a stack of them where the batteries died), and it performed identically so I figured it was the batteries. I contacted the seller and got a refund, and then this week got another set (enough for a single battery, this time), and have the SAME problem. At this point I've tried three different sets of batteries and two different UPS units, and the results have been the same: next to no runtime.

Is there something I'm missing here? I loaded the Powerchute software on a spare laptop to monitor things, and there doesn't seem to be anything out of the ordinary with what it's reporting. The UPS units are a little old, but I don't feel like that should be impacting the runtime, and if it is certainly not THIS badly! I'm open to any suggestion that someone might have, thanks!


I threw a load on the new cells again and pulled the plug, and I'm at about 5-6 minutes on a ~40% load. It's better than the original replacement cells, but I still don't feel like it's up to snuff as to what it should be.

[Anonymous user]

I gave the battery a few days to charge, without interruption, threw the load back on and yanked the cord. The load went up to four bars (unintentional, on my part), but the supply stayed on for what felt like fifteen minutes, but surely more than ten. What was strange is that the charge lights dropped down to 1 light after about a minute or two, and stayed there for the rest of the time. After letting it charge back up to 100%, the battery charge lights are back blinking, and the PowerChute client says I've only got 3 minutes of runtime.

[BillP]

Unfortunately, It's difficult for us to help since you are using third party batteries. The reason I say that is because we can't know that they have the same specs are our batteries. There a few issues it could be(such as an issue with the UPS or a calibration issue) though it's difficult to tell without being 100 % sure the batteries are up to our specifications.

[BillP · Accepted solution]

Apply A 300 Watt Load And Unplug The Ups And Wait For It To Turn Off Then Plug It Back In And Let It Charge For 24 Hours Then Check The Runtime