A terminal-supporting apparatus includes a resin part made of non-conductive resin material and a plurality of conductive terminals including parallel terminal portions which are directly supported by the resin part. Thus it can be charged from an electrical source, or discharged across an external load with the usually high surge current features of storage batteries. At least one conductive element is provided in communication with electrical ground. Agents select tasks to perform from the task queue according to priority guidelines established by a system user. DC and gain offsets may be calibrated before skew calibration.