Are single-use double-A batteries from the dollar store actually worth it? Marketplace teamed up with researchers from Ontario Tech University in Oshawa, Ont., to test 240 of these disposable batteries from six brands. The brands were Energizer, Duracell, Canadian Tire’s Noma, Walmart’s Great Value, E-Circuit from Dollar Tree, as well as Panasonic batteries from both Dollarama and Dollar Tree. In the tests, which simulated different energy drain at continuous levels, Energizer and Duracell laste