Aye, but you wouldn't put them into a UPS would you? The bigger UPS that I have worked with all used very large truck/lorry batteries, which as I understand it are designed to produce a large amount of power for a short time (i.e. to get the engine started) so using them in a UPS was for the same reasons (i.e. you want lots of power for a very short amount of time so you could either turn all your computers off or have your diesel generator kick in).
But if you don't have a generator as well then you possibly would want the UPS batteries to last as long as possible and then a deep cycle battery would be called for I would think ? Note I'm not a UPS expert !
Peter