I've got a 2014 PiP, just fired up Torque with a Bluetooth OBD dongle, and am trying to make heads/tails of the information I'm pulling. The Aux Battery looks appropriate. V01 through V08 I'm assuming look to be the standard battery. V09, V10, V11, V12, V13 and V14 don't make any sense. I'm wondering if that's having to do with the auxiliary battery? My car didn't have a plug-in charge at the time I took this screenshot.
I think the gen 1 Plug-in has the battery divided into 8 modules, and they seem to roughly add up to the nominal voltage of 207 V. The other data can be ignored. Hybrid Assistant or Dr. Prius may provide more useful information than Torque.