Alkaline impedance
https://www.youtube.com/watch?v=q58E8DdNgDs
R_int_Alkaline = 8.4/1.0 - 5.6*1.0 = 2.8 Ohm
R_int_ZincCarbon = 8.1/0.55- 5.6 = 9.1 Ohm
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https://www.youtube.com/watch?v=q58E8DdNgDs
R_int_Alkaline = 8.4/1.0 - 5.6*1.0 = 2.8 Ohm
R_int_ZincCarbon = 8.1/0.55- 5.6 = 9.1 Ohm