Swaytronic - Serial and Parallel Cables. Application: Need to switch from 6S to 12S in seconds or increase the capacity of your battery pack? No problem. Swaytronic offers a wide range of different serial and parallel cables that allow you to quickly reconfigure your batteries for your model. Customer benefit: With the high-quality, pre-made serial and parallel cables, you can adapt your battery packs to your needs in seconds. The great advantage of still being able to use your batteries at different voltage levels remains available to you.