Can't help with a data sheet, but car batteries are not really suitable for UPS use.
They are designed for delivering high cranking amps, but more importantly, they don't like deep discharge. You should avoid going below ~80%, which is not what you want for a UPS.
Whaaaa?! Where are you using your UPS?
Most UPS use is to provide very infrequent backup power for short periods of time during a supply interruption. This is very similar to the use of starting a typical automobile engine. Most of the time you use just use little more than the surface charge for a moment or two, rarely discharging the cells more than a few percent to ride you through a short interruption in mains power.
Most UPS installations do not often require repeated long-term, deep-cycle discharges. The few times where you actually have an extended outage, a typical automotive starting battery is certainly sufficient for doing the odd full cycle here or there, though it significantly reduces the total lifespan if you do that more than a few times. As long as you only do it a few times in the lifespan, it is totally fine.
REPEATED deep cycling is a completely different story (off-grid solar etc.)
I very often use cheap starting batteries for my UPS systems! You just need to look at the "reserve capacity" spec more than anything else. The servers here in my basement usually have a 2 x 2 series / parallel (it is a 24v UPS) set of cheap 120 minute "reserve capacity" starting batteries connected to them which generally last about 4-6 years or more in constant "float" mode, even from the typical over-volted APC charging circuit. As long as you buy the ones that you can replenish the water in the electrolyte on, you should be good to go for many years.
Different battery styles are built with different chemistries and physically different plates. A starting battery will have more, thinner plates to provide higher instantaneous cranking power. A "deep cycle" battery intended for repetitive use will have fewer, but thicker plates, thus a lower "cranking amps" spec, but better total long-term capacity and cycle life.
The last set that I rotated out from the office were only ever used a few times for < 10 minute outages and two deep discharges during prolonged outages (one being a scheduled outage from the power company, in our case requiring me to bring in a backup generator overnight, just sat it in the reception area with an exhaust out the window... lol
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Spending the extra dough on a set of deep cycle batteries for that usage would have cost 4-5x as much and in the end, they would have only lasted 0.00% longer in service life.
Unless you need constant cycling, a good quality starting battery is actually the proper fit for most typical UPS usage (charge/discharge) profiles!