What did the Empire do with the millions (if not billions) of deactivated battle droids after the end of the Clone Wars? Were they melted down? Were they kept in storage?
Any canon or Legends answer will be accepted!
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At least some of them reappear on Agamar in Star Wars Rebels season 3 episode 6 "The Last Battle".
It appears that some of the droids avoided deactivation (the Super-Tactical-Droid commander of that unit believed that the deactivation order issued at the end of RoTS was an enemy trick, and ignored it) and carried on, as an autonomous Separatist Alliance unit.
It is not clear what happened to the droids who were deactivated.