1.Don't short the battery bank +ve and -ve in same battery or total bank.
2.IF 2 volt battery after discharge test the voltage should be 1.75 v or as per data schedule.If less than this value battery should be change.
3.The individual can't test in the site level.Each cell as 2 volts and it can't drive more current and total discharge time will take more time.New replacing batteries should test with total batter bank.
4.The discharge test load current will calculate by Load Vs Time chat available in battery bank manual.