The upgraded Evic VTC Mini (v2.0 firmware 75watts) the new display shows wattage setting, resistance, amps during output, and believe voltage, but not voltage in 3.5v left or 50% (Sigelei does this) but just a battery bar.
You'll probably find all of them displayed on your higher end devices with an Evolv
dna or Yihi SX Chipset. All the
dna board devices I have show a battery icon, resistance, wattage set, then when firing the voltage it is applying (DNA20 and DNA40), don't know what the DNA200's display. You're being pretty specific though asking for numbers instead of symbols on battery left.