Bullet proof glass, not proof against explosives, this is rarely an issue for me because I don’t like leaving behind a recognizable corpse.
C4 is the perfect solution for that problem, assuming of course, that a Ninja Bear™ doesn’t suddenly rip both of my arms off before I can prime it.
My last four or five deaths have been explosive related, only one of those was Point Blank LAW though, damn Jabberwock ran around the corner of a nearby evac shelter as I was looting some military corpses, nearly killed me before I finished looting, and I hadn’t had a chance to loot a gun store yet, so LAW was my best choice for taking out the Jabberwock (survival being an unfeasible secondary goal).
I’d definitely like to see more ways of gaining and transferring power though, batteries get a bit old after awhile and there’s tons of gasoline available now that we can siphon the wrecks lying around, it just takes awhile to get enough of it to last.