Выражение встречается в следующем контексте: If the MIRL Battery Pack fails, a standard 9.0V battery, 522 or equivalent, may be used together with a Battery Override Supply Cable (9VBOC) to power the MIRL so the door can be opened with a valid card. The battery override cable plugs to the battery override connector fpund on the lower part of the card reader base plate after removing the card reader cover.