The iD L has it too. I took out the piece in mine, and I just opened up my iD L to check it out. It seems that it is for the battery as one of the circle pads is labeled "BAT +" The rest above that one are labeled GND, DCLK, DST2, DS10, DPCO, DST1, and DST0. I'm not sure about the P's, however, they are likely the same. I could open my P's to things out.