The fix of Optera's original is really quite simple. Go to his original and see my comment.

This here, apart from having basically no coding skills whatsoever (yes, I'm pissed off), removed the bot battery research because of said lack of skill, with no need, and changed one cost… but worst of all:

REPLACED Optera's LICENSE WITH THEIR OWN. You DO NOT DO THAT, EVER, unless you have to original author's explicit (preferably written) permission.

What is the "really simple" fix? There no post from you on Optera Mod page.

Apologies for the extremely late reply, my email notifs weren't enabled and it's been over a year since I even touched Factorio.
I have since set the mod to "Deprecated" to (hopefully) delist it so I can fix all of the issues and make sure Optera's License is reinstated (I don't even remember doing anything to the license, but I'll make all the proper effforts to rectify that)

I had since changed systems and don't have the original mod files, so likely I'll remake the fix from scratch, now that I have a significantly better idea of what I'm doing.

Furthermore, I won't be relisting the mod until I can make a formal apology to Optera and ask explicit permission to upload this fix, regardless of any and all changes made