One of the most frustrating steps when building a big battery that is taller than 3 blocks is making sure that the acid is correctly filling every space.
It would be great if sulfurous acid blocks could be created by combining one acid bucket with a slime ball/block.
The block would be exactly the same as a slime block but the same color as the sulfurous acid.
This way creating or enlarging a battery would be a bit easier.