You should never charge batteries in series, unless they are exactly matched and exactly discharged, the voltage across them will be unbalanced and one may overcharge while the other undercharges.
I think they have used a 'double cell' symbol for the batteries when it really means just one, consider that AA and AAA are single cells but 6F22 has six in series! Other wise the two circuits are identical.
No, it has no cut-off, it is just a variation of a standard LM317 constant current generator with the extra parts being to allow more than one output.
Brian.