Unplugged

After taking enough damage, robots will kneel down and start steaming as they overheat. This is the time to go behind them and interact with the Atomic Battery plugged into their back to take it out.

Note these are the same kind of Atomic Batteries as you need for the story, and can be used for the same purposes :)

NB you can put the battery back in again if you like for Batteries Not Included