gm! Creating a series or batch mint installs the extension to your contract, similar to installing the Claim app etc this is a onetime gas charge for each contract.
Interesting… this is an existing contract with many tokens already minted. Is that due to it being a batch? Or yet another batch? The contract has a number of batches already minted.
So basically I can just reject the final mint transaction and come back next month when gas is below 30 again?