I too have a PVS-14 for SHTF situation, Hunting and general night pinking. For the SHTF, I have decided on the ELB Rechargeable AA batteries. I do run the Energizer U-Li right now, but if it hits the fan longer term, the PVS-14 will see a lot more action, and eventually the batteries will run out.
The ELB AAs have an advertised mAh of 2800 (about 2400 in real), and over 100 recharges tested to retain at least 90% of the original capacity. These can be recharged using any number of methods (Solar is my choice, as its nearly labor-less and abundant). These batteries are also a bit lighter than most alkaline batteries. They can also carry over into other uses such as Flashlights, Red Dots, GPS, Calculators, etc.
Just my $0.02