Gram equivalent weight of sulphuric acid in the reaction involving Lead accumulator is

Equivalent mass depends on the reaction that is going on. 

Generally  the H⁺ of H₂SO₄ reacts and thus for each H⁺ , you need half of H₂SO₄ because one molecule produces two H⁺ ions.

In lead storage battery, reactions given as ,

The equation tells us 2 mol of H₂SO₄ consumes 2 mol electrons 

1 mol H₂SO₄ consume 1 mol of electrons so, n=1 

$Equivalent mass =\frac{molecular mass }{1}=\frac{98}{1}=98 g.$