I am also a big proponent of battery backed up emergency and egress lighting (Bodine or one of the others). I have trouble with lack of maintenance of the batteries per NFPA 101 Life Safety Code. Even some of the newer self test units, get ignored when they fail.
Most if not all sites I work on have 702 type generator needs for the entire building, so to utilize them for 700 and 701 loads are easy (although I have trouble with many of my associates/EC keeping 700 and 702 load separated). I prefer to have both battery and genset backup for emergency and egress lighting, as one will fail at some point. The folks I deal with are more likely to be nervous if the genset is not maintained well, as opposed to the battery lighting, because the 702 loads are their "cash cows".
