
% ----- minimal example -----
\documentclass{article}
\usepackage{relsize}
\usepackage[
    acronym,
    smaller,
        ]{glossaries}
\newacronym[
%        ]{BVeq}{BV equation}{Butler--Volmer equation}
        ]{BVeq}{\textsf{BV} equation}{Butler--Volmer equation}
\begin{document}
    \gls{BVeq}
\end{document}
% ---------------------------
