rate contract for supply and installation of batteries along with buyback of old batteries of online ups at cng stations in lucknow and unnao ga of green gas limited rate contract for supply and installation of batteries along with buyback of old batteries of online ups at cng stations in lucknow and unnao ga of green gas limited , part a: supply and installation of new batteries please reffer items, the details of estimated amount are mentioned in tender document section-viii estimates and schedule of rates[sor]. , part b: buyback (i.e. minus) amount of old batteries please reffer items, the details of estimated amount are mentioned in tender document section-viii estimates and schedule of rates[sor].