Output data to spcbattYYYYMMDD_HHMM.dat files is CSV format with fields:

  Date as YYYYMMDD
  Time as HHMM
  12v Power Supply, volts
  12v Battery, volts
  48v ADCP Voltage, volts
  Battery current, amps (+ = charging)
  ADCP current, amps
  Box Temperature, C
  Watchdog Resets, count

  Example data:
  20190920,1600,14.83,13.65,49.94,0.141,0.009,25,0