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the cells are all 1.2v each. the milliamp capacity assigned for each cell is what the mah capacity of the battery will be. to get the desired voltage, you connect the cells in series, so for 8.4v you connect 7 x 1.2v in series = 8.4v. for 9.6v it's 8 cells, for 10.8 it's 9, etc. the current capacity/cell in series = complete battery current capacity, but voltage is additive. in a parallel arrangement (not recommended unless you really are an expert in electronics) the voltage /cell = complete battery voltage while current capacity is additive. as far as size goes, cell size is an indicator of current capacity, but the voltage will be 1.2v/cell for the batteries we use.
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