Better get a desi UPS made from Imran Brothers Hall road using IB4 or IB9 kit. Desi kits have improved very much these days only need to take care of them. If going with single battery setup then get module of 10+10 75N75 even if your ups is 700 watts. It will not burn easily.
For Battery go for AGS or Phoenix, Exide proved to be useless in past. Branded ups only have only 10 amps charging rate or some good have 10 and 20 volts, while with desi there is full control over charging amps, output voltage, battery cutoff, low battery shutoff settings, overload settings etc...
In branded stuff I think only APC proved good and that too altered from some good engineer to be used with LSA battery. Saw some homage models running good too but most have issues.