How does one determine what wire gauge to use when building a battery by connecting lower voltage cells in series?
e.g. Let's say one is building a couple of 12V batteries that are expected to supply 100 amps continuously. The first battery is composed of eight 1.5V cells. The second is composed of two 6V cells.
Using a wire gauge table I've determined that one will need a 4 AWG cable 6' or less in length to handle 100 amps with <3% voltage drop.
What gauge wire should be used to connect the cells from the examples above in series? Should the internal cables also be 4 AWG? Do the number of cells and their respective voltage matter?