Introducing the MLVSS (Mini Lipo Voltage Sensor w/ Smartport). FrSky miniaturized the FLVSS by removing the OLED screen and reconfiguring the remaining circuit into a more compact design that has reduced the size and weight of the original by approximately half. This appeals to those of us who have smaller, or weight critical aircraft. Other than the absence of the OLED screen, the functionality of the MLVSS is identical to that of the FLVSS, with the exception that you cannot connect two of these in series to measure voltages in excess of 6s.
This is a perfect drop in replacement for the previous screen version. I had an extra one of these on hand at FliteFest and was able to replace a friend's screen version sensor that damaged in a crash. No changes to radio programming or anything - it just plugged in and worked!