Part 1: Battery Chemistry Foundations 

3400mA is correct due to the higher voltage.

Impedance normally has real and imaginary part under various load frequency and resistance is normally refer to real part under DC load.

Hi Jessica after 4 years of your question I can answer :-) to keep it simple in addition to what was said , impedance has to do when you deal with varying voltage and current such your home electricity plug and resistance has to do with direct voltage and current dc.. example battery