Quote: Originally Posted by Britton30
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.