What exactly would you like regarding the battery use of them? Their current power capacity is so low it is all but useless. Do you want the option for them to act as batteries too? I'm not sure that is the idea of this mod, but can add it as an option if really wanted.
In my mind, they are supposed to be a trade off for their added inventory space, adding true battery storage would negate a bit of the trade off. More inventory space and take up space in armor grid that could be used for other things such as more batteries.