it is winter time.
I has switched to winter EPLUS bike for riding.
time to improve on my summer EPLUS battery made of ChevyVolt cells.
as we know cathode is positive terminal during discharging and it is aluminum .
anode material is copper
aluminum oxidizes really fast during battery cell assembly, by the time I screwed cells terminals they are covered in thin, thin layer of oxidation - if you connect 11 cells in series this oxidation can add up to increased battery internal resistance.
so I spot soldered every cathode-anode , +/- , connection with special flux and lead-free solder, immediately after cutting corner of tabs.
here are the pictures of my battery inside - 11 cells in series , 11S , 2 subpacks , 6S and 5S .