Convoy C2 Battery / LVC Queries

Does anyone know if the Convoy C2 (not the +) has and warning the batteries low … I had one but sent it to my son at Uni but with protected batteries but am about to order a new one as it’s a great cycling torch but 2 of my friends have asked me to order them one and some batteries as well but they aren’t very battery savvy.

If there is a warning what is it or does it just cut out and also with protected batteries and idea what’ll happen … could be dangerous cycling somewhere fastish and the light just goes out.

Lastly any idea of maximum length battery it’ll take.

EDIT: I’ve searched around and found it does have low voltage warning …… if anyone knows the maximum battery size though would be appreciated!!