Paul,
I originally thought that the 3rd Division just had one converged Light Infantry battalion for the whole Division, then I came across the following in “Present State of Portugal and of the Portuguese Army” – Halliday” - Page 329 – Fuentes de Oñoro – Light infantry battalions (note plural) of Maj Gen Picton’s Division under Lt Col Williams (5th Bn 60th). Light Infantry battalion of 3rd Division commanded by Maj Woodgate (5th Bn 60th).
So I think this makes two light battalions.
Rod