Building myself some new 2S charge leads, but I'm short on some 18 AWG wire for the balance connections. Primary leads will be 12 AWG silicone jacketed. No one has any more cable locally, and I'd like to build this week if possible. Leads are ~ 3' long, charging at no more than 15A.

My options are:

1) Build the three balance wires with a mixture of 18 AWG and 20 AWG silicone jacketed wire. This makes me nervous because I can't help but think the difference in resistance per unit length of the different wire gauges is going to produce a different voltage drop over the length of the cable, and lead to poor balancing of the cells.

2) Use 20 AWG wire, some silicone jacketed, some regular. I'm not too concerned about the flexibility of the cable, since this is the smaller gauge wire, but see above for concerns re: different voltage drops over length of differently constructed cable.

3) Take the ~+7.4V and 0V connections from the charger end and just run the intermediate connection down the length of the lead. This is the extreme solution, since now two leads see 3' of 12 AWG wire, and the intermediate sees 3' of 18 AWG.

Am I being wreckless? Worrying unnecessarily? Any help appreciated!