sid wants to compare two different brands of batteries. which of the following exerperiments would help sid do this

Edit the post so i can see the letters for each answer, and increase the points required so i'd be able to answer it.

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.