Consider replacing your flashlights with headlamps, they're not very expensive (can get nice to get one with hi/lo/red for under 30$).
Having free hands in the dark makes me able to do things a lot quicker so that I don't get eaten by mosquitoes but in shtf scenario speed can be much more important. most run off AAA and most have how long they last right on the back of the box.
Here's mine, no complaints.
http://www.mec.ca/AST/ShopMEC/Electronics/Lighting/Headlamps/PRD~5031-544/princeton-tec-byte-50l-headlamp.jsp