On 16 November 2013 00:23, steve-ALUG@hst.me.uk wrote:
Not trying to sound argumentative, but what you're saying just doesn't make sense to me. Am I missing something?
Yes, you're missing something, but that seems to be "by design". Battery/UPS technology seems devoid of meaningful marketing information, and I suspect that "most people" believe that a 1500VA UPS will last twice as long as a 750VA UPS. Quite why the likes of APC don't do more to dispel this myth defeats me - their low-end 750VA UPS is otherwise easily beaten by a cheap 1500VA unbranded UPS.
At least with other rechargeable batteries, such as phone or NiCd/NiMH AA/AAA/etc, you do get some idea of capacity in the mAh values - mAh again isn't sufficient alone to tell you how much capacity a battery has, but combined with knowing the voltage of the battery it is (and at least that is also specified on the battery). The cordless phone next to me has 800mAh 1.2V NiMH batteries in it - ie 0.8A (800mA) at 1.2V for 1hr, or 0.4A at 1.2V for 2hrs, etc.
I did once ask an APC salesperson about this and the response was something detailed and helpful like "I dunno" so I gave up.