[quote=“marghuzar, post:, topic:”]
AoA... Last May,2014 I bought New AGS 175 battery and installed it with Homage UPS, UPS charging rate is set on below 15 amp.
It gave me 5 hr backup on 02 fans and 03 energy savers During hot weather.
When winter started, its utilization reduced to 03 energy savers only and in day time I use to keep UPS switched off.
Now when hot weather again Starts, I shocked to experience that this Battery giving me 1.5 hr backup on 02 fans.
Gravity is normal as it should be,
Battery Mechanic did not check the battery but told me that plates need to be replaced Which will cost me worth 6000/=
Dont know whats wrong with my battery.
Can ny friend know or guide me how to diagnose or detect the actual problem ???
this is obvious , it is clear from the scenario you mentioned , your battery was useto of full discharge and charge cycles in last summers , when the winters came the battery was never utilized as much as you were discharging it in summers , the plates of the battery is now having sulfates over them PARTIALLY (not fully) , now do the followings and your battery will b rejuvenated again in sha ALLAH .
Use the battery upto extreme conditions , means aggressively USE it , run the FULL load of your UPS constant u will see your battery is heating up . doesnt matter , Let it get Hot . when it comes to cut off volts turn it off oryour UPS will shut automatically , Let it be .
After that keep it charging fully (and not use until it charged fully - full means 100 percent charged)
after charged , use ur battery like previous behavior means aggressively use it and discharged fully , The charge fully and dont use the battery before it gets fully charged .
u should repeat this process minimum 15 to 20 times .
The second technique is to hook a de-sulfater Thats a small gadget that produce high voltage pulse and use the current / volts from the same battery . But when you apply that gadget remove the terminals of the UPS or it may damage your UPS . Let it be there over night and in morning detach it and use ur UPS , and in the night again hook up the de-sulphater . its price is around 2500 to 3000 Rs but it is worth to have it . I have used it and found VERY effective with one of my spare car battery LED ACID one , also i used it with my computer APC ups's battery and it simply marvelous in results . I actualy borrowed that gadget from my cousin's friend its available in karachi saddar area with warranty that if you are not satisfied in a month then cash back , search for the sources .
Third remedy is to charge the battery in a SLOW amperage lets say 5 or less Your battery will b ok in sha ALLAH .
If your UPS has an option to reduce the charging current then reduce it and you will find the difference in backup time - but it will take much time to get charged as compared with the 15 amps before .
several other methods are also there but i think this is enough for your battery , Hope u will find it helpful .
Also measure your UPS charging current is it really 15 amps or not . (just in case)