Six-cell A123 battery packs with a nominal voltage of 19.8V. All of our A123 packs are produced using genuine A123/LiFe cells from A123Systems.
When charging A123 battery packs comprised of six cells in series (6s) do not charge above 21.6V.
When using 6s A123 packs in your RC model, do not discharge below 15.0V, this will ensure a long service life.