Some cameras which take two LR44 or 357 do not well tolerate a single 3V Lithium substitution! It is not uncommon for Lithium to be EXCLUDED by a manufacturer. Bronica/Tamron excludes Lithium for its SQ and GS medium format, while it is OK for the ETR.
Right. Bronica/Tamron cite wide variability in output curves and peak power with different lithium batteries.