There is a very special battery on the wall in Chapter 2 of "Dead Space: Remastered". If you want to continue the mission, you need to find this battery. In fact, it is opposite the battery compartment. You can close it. All powered, you can unplug the battery powered module there.
Chapter 2 Where is the battery on the wall?
Looking back, at the power panel at the back, turn off all power supplies and then unplug the power supply module. Note that after pulling it out, a wave of monsters will spawn.