Battery used with ups is just a charge accumulator, it stores the electricity when wapda's light is coming and during power outage it provides the accumulated electricity to ups which converts it to 220 volts AC.
I want to know, and others would also be interested in it, what is the price of one unit of electricity thus obtained (only the running charges, ignoring the initial investment on ups and battery).
A petrol generator of Honda of 1.3 kVA produces electricity @ Rs. 65-70 per unit (approx).
Generator Model: EP1800C
Rated Output 1.3 kVA
Consumption 0.97 litre / hour