A Lua script developed by Heisenberg and published on the French frskytaranis.forumactif.org forum allows users of an FLVSS or MLVSS LiPo battery sensor to check the voltage level of each cell of their battery pack in a well-designed interface.

English instructions available on Craft and Theory's blog: http://www.craftandtheoryllc.com/lipo-battery-checker-script-for-taranis-x9d-x9d-and-x9e/