At the moment, I don't interact with batteries.
I could some day add handling for the third power priority, but even then you wouldn't have enough priorities to do what you outlined (I only have 3 to play around with - primary, secondary, and tertiary.)
Out of curiosity, I'm assuming the 3 tiers is hard coded into the base game? I know I'd like to have more tiers too but if there's nothing to be done.. oh well.
Cheers