I think that these objects must be from Fla series - for sure a bunker for electrical equipment used in these types of batteries in Poland was Fla 1, gun emplacements are very similar to Fla 14, and sometimes you can see command bunkers Fla 16.
Slight modifications can be seen in these bunkers - ammo storage in Mielin battery has an entrance in different place.
Alkali - do you have a plan of command bunker from Ustka?
Does anyone have, or does anyone know where to find plans of following Fla bunkers: 2,3,24,24a,25,26,27,33,33a,51,52,53,60,66,72,77,78,79,104,108 ??????
I will guess the answer - in BA-MA Freiburg

regards
Maciej