I purchased 175a Volta battery about 7-8 months back, since it was winter so didn't get to use it under full load.
Now [in summer] when I apply full load on it , it gives me really low back-up time (around 15 min on half load)(1).
After observing the acid, I noticed that the battery hasn't been getting full charge and maybe is going through Sulfation(2). The cell had grey in little quantity (muddy texture around it - some even floating) [small sulfate crystals ]
The battery would get fully charged under just ~30 minutes (It didn't warm up the battery) and the Charging rate was about 14v to 15v (I meausured that by placing the digital meter on the two cables of the UPS whilst it was connected to the battery terminal - Setting Digital Meter to 20v)
I changed the electrolyte at home and didn't notice any change but I did find out something .
I kept on observing the battery's voltage (under 2 fan and 1 Energy saver) - it started with 13v and in about 20 min it decreased to 11.5v , but just right then it went down to 6v and UPS started giving low battery Alarm . (From 11.5v to 6v within split second)
What possibly could be the Problem of Such Rapid decrease in voltage ?
All Cells Bubbles when charged, I don't think so they are the problem but who knows.
Your Help will be highly appreciated
(1) I am using 1000w local made UPS
(2)Sulfation occurs when a lead acid battery is deprived of a full charge