Four-cell A123 battery packs with a nominal voltage of 13.2V. All of our A123 packs are produced using genuine A123/LiFe cells from A123Systems.
When charging A123 battery packs comprised of four cells in series (4s) do not charge above 14.4V.
When using 4s A123 packs in your RC model, do not discharge below 10.0V, this will ensure a long service life.