UPS volt-amp-hour capacity vs battery Ah not the same?

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Joe40

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Ok I'm I missing something here? Shouldn't these two essiental be the same capacity when converted?
i am looking at the [h=1]APC Back-UPS Connect 70, 120V, Network Backup
BGE70[/h]http://www.apc.com/shop/us/en/products/APC-Back-UPS-Connect-70-120V-Network-Backup/P-BGE70

http://www.apcmedia.com/salestools/CLII-9KSS2D/CLII-9KSS2D_R1_EN.pdf?sdirect=true

links provided to the tech page and the brochure page that shows the battery's actual capacity in Ah... which is 4.5Ah
The other tech page say the battery's volt-amp-hour capacity is 46 so if you do the simple conversion to get it to amps by dividing it by the batteries volts (12) it comes out to be 3.8Ah?
why is this not the same (4.5Ah)?
Hopefully you guys can help,me out here?
Thanks!
 
While the nominal voltage of the battery is 12V, the actual output voltage will change during the course of discharge.

If the average discharge voltage is less than 12V (which it most certainly is) then the volt-amp-hour capacity will be less than 12*amp-hour capacity.

-Jon
 
Just to be clear, those are very low power, low end UPS's. They're only rated 70 watts and they have a square waveform (you won't know what that means).

What is the application that you need a UPS for?
 
Thank you everyone for your replies! I was thinking it was something that had to do with efficient/ those variables...
and yep I know it is not like the big boy UPS's... but again that's why you can get so much runtime out of it when running low power devices on it...
so yep that's what I plan on using on it, pretty much USB devices... low amp/watt devices which I don't think gives a hoot if it is square or perfect sine wave! Lol
thanks again everyone!
 
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