Does the UPS specifications make sense to you as far as battery current go?
It's the battery the manufacture specifies for that UPS, and CyberPower is a reputable brand.  I expect it'll work just fine - as long as you keep its specifications in mind.
The UPS itself is rated for 2.5 minutes of run time at full load.  That is, it will run for 2.5 minutes while delivering 1000 watts.
That's a 9Ah battery.  Just on the mathematics, that's about six minutes at 83 amperes.  Throw in losses (conversion to AC and from heating in the battery during discharge,) and that 2.5 minutes sounds about right.