out-of-battery

Short definition from Wiktionary

Adjective

1. 1
   In firearms and artillery, having a condition in which a live round is at least partially in the firing chamber and capable of being fired, but is not properly secured by the usual mechanism of that particular weapon.
2. 2
   In battery-powered electronics, devoid of any power.
3. 3
   Alternative form of out-of-battery.