A Q-Cache is a military storage depot in use by the Colonial Military during the final stages of the Thousand-Yahren War with the Cylons.
Information regarding Q-Caches were programmed into Vipers and other military crafts, so that they may resupply as needed (Classic Battlestar Galactica Vol. 2 #2).
Known Q-Caches include:
Craft: Baltifer's basestar | Galactica | Pegasus | Rycon
Groups: Colonial Resistance | Cylon Empire | Twelve Colonies of Man
Events: Battle of Cache | Battle of Cimtar
Locations: Cache | Caprica | Equellus
Technology: chronal cannon | sensor shield | signal disruptor | temporal warp drive