Dalek Battlecruisers were a large part of the Dalek Empire's fleet. Hundreds of battlecruisers flew with Movellan Battlecruisers during the Daleks' war with the Movellans due to a stalemate that had been reached. (DW: Destiny of the Daleks)
When Davros, the creator of the Daleks, was locked in a prison space station, the Daleks used one of their battlecruisers to attack the station and retrieve him. (DW: Resurrection of the Daleks)