Newly arrived AN/PEQ 16 Battery box made by Element which is being sold by Airsoft Park for US$29.99 with free shipping included. This product has been extended from 65mm to 70mmm and can accommodate mini-type Lithium/Nicad/NiMH and even can also take in the Element 11.1v 20C 900MAH lipo battery designed for it. The material is high quality polymer, and we do see a light bullb in the photo, but it may just be a cosmetic part of the box rather than a functional one.

If you want a battery to go with it, you can also check their package for this battery box and lipo battery.