Walk onto the pressure plate and note that this causes one of the walls, of the nearby cage, to rise. Use the glue grenade here, there times, which will insulate the pipes. You can now enter the cage and reach the Datapack.
Datapack 4 (The Police Station)
You can find the collectible in the basement of the police station, in the location with the Holding Cells. Start on the upper level of this location and make it over, using the hook to the security room. The Datapack is on the desk.
Datapack 5 (The Police Station)
The collectible is in that you are looking for is in the GCPD – Morgue and the way to access it has been described in the Scan the corpse in the GCPD morgue main mission description.
After you make it to the morgue, use detective vision to locate the fragment of the floor that can be destroyed with explosive gel. Doing this, will allow you to obtain the Datapack.
Datapack 6 (The Police Station)
The collectible is in the Northern part of the police station, close to the SWAT conference room and the interrogation room (the above screenshot).
Start to the North-West of the collectible and locate the big window that you can walk through. This way, you will access a locked office with the Datapack on the floor.
Datapack 7 (The Police Station)
Start in the room neighboring the SWAT – Interrogation Room, which is located in the Northern part of the building. Select the remote controlled batarang from the inventory and throw it towards the interrogation room. After the batarangs flies into the room, turn it back, look up and use the claw quickly to grab the Datapack from the box above the broken one-way mirror.
Datapack 8 (The Police Station)
Start in the SWAT – Manager's Office which is located in the North-Eastern part of the building. Locate the door shown in the above screenshot and open it by charging the generator next to it (use the Shock Gloves). You can now enter the SWAT – Locker Room where there is the Datapack.
Datapack 9 (The Police Station)
The collectible is in the Evidence Locker and the way to reach there has been described in the Acquire the disruptor at the evidence locker main mission description.
Start in the shaft located to the East of the evidence locker, while on the rope that you extended with the grapple. Turn towards the discharges shown in the screenshot and throw there the remote controlled batarang, which will charge it as a result of contact with the discharges.
Direct the batarangs towards the small venting shaft leading to the evidence locker, and then towards the fuse box located to the right. You can now return to the evidence locker and examine the newly-unlocked North-Eastern part. The Datapack is on the floor.
Datapack 10 (The Police Station)
Visit the SWAT locker room [SWAT Division], located in the Western part of the police station. Use the detective vision here, to locate the locker containing the Datapack, and open it using the claw.
For finding all of the datapacks, you are rewarded with the audio file connected with Joker.