Can i use 9ah Batteries instead of 7ah Batteries in the UPS?

Hi.. some months ago my UPS batteries died on me after a little more than 1 and half years and then i replaced the batteries from the same store few months ago. The batteries that came in the UPS were 12V 7.5ah (each) and those guys convinced me that 12V 7ah (each) batteries will work fine too.. now a couple of days ago i had a power-failure and the UPS kept the PC hardly 8mins and suddenly started beeping fast and shut off everything even the LCD was running on lowest contrast and brightness and only windows was running so there was no peak load as well on PSU and the last batteries used to give around 15 to 20 mins easily.

So now i know those liars sold me out the low-quality chinese made batteries which cannot even give much backup time and who knows if they're refurbished? they did'nt came with any warranties. Now my real question is im looking to buy some better qualities Lead Acid Batteries for the UPS and i was think if i might be able to use 12V 9ah batteries instead of 7ah or 7.5ah.. i heard that the 9ah will hold more charge and can give some more time for backup (just in case) will they work?

Hi boogie , You will be fine using the 9ah batteries as long as the charger inside the UPS can sustain the charge rate on its float cycle (it should be able to ) , When you bought the 7ah batteries were they fully charged ? :)

Yes pebbly i charged them alone for about more than 15 hours and they are always fully charged :) but they are not good quality

Here you go excellent quality...should last for months on a single charge:) Forklift Batteries - Reconditioned 6-85-11 Forklift Battery one year warranty Forklift

Don't drop it on your foot

Boogiem the 9ah won't last longer nor hold a charge longer than a 7ah battery. It will have more amp hours output, say, to run more things on battery.
Aside from paying a high price for a battery from the UPS maker, buy one with the same specs in a brand you know to be reputable for your area.

Britton30 said:

Boogiem the 9ah won't last longer nor hold a charge longer than a 7ah battery. It will have more amp hours output, say, to run more things on battery.
Aside from paying a high price for a battery from the UPS maker, buy one with the same specs in a brand you know to be reputable for your area.

How do you figure that? The 9ah will run longer
Amp Hours basically gives a reference on how long a battery will run on a certain load, example, a 1amp load will run 9 hours on a 9ah battery and 7 hours on a 7ah battery. a 9 amp load will run 1 hour on the 9ah and 45 minutes or so on the 7ah.

And the capacity of the battery won't boost up the VA rating of a UPS, that is determined by the DC to AC circuits in the UPS. All you will get is extended run time.

Are the 9ah batteries the same size as the 7ah ones? If larger, they may not fit in the UPS case.

The goal of a UPS is to keep your system running long enough after a power failure to be able to save your work and do an orderly shutdown. Seems like 8 minutes is plenty of time to do that. If you really want to be able to run for the duration of the power failure without interuption, you should look into a backup generator.

Zepher said:

Britton30 said:

Boogiem the 9ah won't last longer nor hold a charge longer than a 7ah battery. It will have more amp hours output, say, to run more things on battery.
Aside from paying a high price for a battery from the UPS maker, buy one with the same specs in a brand you know to be reputable for your area.

How do you figure that? The 9ah will run longer
Amp Hours basically gives a reference on how long a battery will run on a certain load, example, a 1amp load will run 9 hours on a 9ah battery and 7 hours on a 7ah battery. a 9 amp load will run 1 hour on the 9ah and 45 minutes or so on the 7ah.

And the capacity of the battery won't boost up the VA rating of a UPS, that is determined by the DC to AC circuits in the UPS. All you will get is extended run time.

I stand corrected. I was going from my experience (In auto part) with automotive batteries. Seaeld Led-acid batts may work differently.