So wire gauge is calculated in kcmils (don’t get me started on this stupid measurement system) which is a circular volume of cross section but the nice part of the system is it is math is basically decimal inches diameter x 1000. One thing that’s good also is adding circular dimensions is easier because just using the total cross section isn’t equivalent to the total of each individual strand as dar as electrical resistance is concerned.
The braid that is rated as a conductor will have the rating available which corresponds to this dimension. Because it isn’t insulated it is probably best to avoid the published rating and instead use the equivalent cross section because battery use case will be enclosed and not free air like is assumed by bare conductor ratings?
Example:
This is just from an amazon ad, bulk buying from other sources is harder but going to a local electrical supplier will usually get you genuine awg equivalents as all the stuff they sell here in the us has to be listed. The mix of units in this ad contributes to the confusion so I’m just gonna use metric. Because i can easily find awg to metric equivalent tables.
40 strands of 10 .12mm wires
.12mm is apparently between 36 and 37 awg which has an area of between .0127mm2 and .01mm2. But im going to use .01 because math is easier
.01 x 10 x 40 is 4mm2. Or just shy of 11awg with some margin.
So this example is probably good for 40-50 green column or 80-100 red column