Lost Vape Skar DNA 75 Battery Settings

[HelloNasty]

Hey folks, 

Admittedly new to the DNA scene and I have some core questions that I want to take note of on my Skar before I dive into setting up my Asmodus Oni. I was recently given a perfectly good Skar and I have found the file to set it back to factory defaults but my battery longevity is absolute trash, compared to other single battery mods I have. I've heard that setting up DNA with the specific battery specs you're using will significantly improve that. I'm my case in using 25r's. 

Could you point me in the right direction where there are good tutorials to read or watch just to help me with these two mods? I understand they have two different boards but I should be able to use, at least the same battery settings, since they'll both use 25r's. 

I haven't even used the Oni and it's brand new. It's driving me nuts. 

Thanks in advance.