How to use batch object rename addon:

1. Select all the object that you want to rename
2. Click "rename object"
3. Click ENTER to start
4. Object that you want to rename has a yellowish color and the scale is 2 times bigger
5. Rename the object then click enter to confirm it
6. Click ALT to go to next object and then you can navigate to search the object
7. The process will repeats until the last object
8. You can press ESC to terminate on going process / cancel renaming
   
   

How to use batch material rename addon:

1. Select all object you want to rename
2. Click "rename material"
3. Check the "Single user material" if you want separate the same material for each object (each material only applied in 1 object). Uncheck if you want the opposite.
4. Done

Tips:

When renaming object, divide your renaming group into a small group so you don't get lost when search for current object (example: Instead of renaming 200 object at a time, it will be better if you divide it into 20 object)