16-05-2011, 04:31 PM
It means that there are three cells in series (that's the 3S bit of course) but only one parrallel combination of this arrangement - it's a bit redundant in the standard configuration. Compare it with 3S2P which means six cells altogether, but with an arrangement of two parrallel sets of three series cells. So 3S2P is still only 11.1V, but with twice the capacity of a comparable 3S1P arrangement.
Steve Murray