Once you have stolen the giga battery, the area of midtown will go into lockdown. When you try to return to clementine, you will find that there is a large security barricade blocking the way into the apartments. I wasted quite a bit of time trying to find a way to get around this but the solution is actually super….simple.
You just have to run under the metal barrier. It seems the cops here do not see you as a threat just yet.
Once you get inside the apartment area, it is not all smooth sailing however, there are going to be lots of robots patrolling the area that you will need to sneak past without getting caught. The video guide below will show you how to get back to Clementine if you are having trouble.