What Palpatine did with Super Battle Droids AFTER Order 66 - Star Wars Explained

After Order 66, the Separatist droids were no longer used by the Empire like they were during The Clone Wars. What did Palpatine do with them once Vader turned and joined him in ruling the galaxy?
Think we'll see more B2 Super Battle Droids in The Mandalorian Season 2?
Hope we get another Mandalorian trailer soon!
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edited by ‪@StarWarsElseworlds‬