OKL2-T vs an m12 battery

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has any one thought about making a mod using a milwaukee m12 battery, it is all ready a regulated 12v output with a low voltage cutoff. like what I am thinking is either hack one the power adapters like what comes with the heated jackets or 3d print one up. this is something random that has crossed my mind to use with a okl2-t chip, it is a battery I have several of an come in two sizes. the smaller one I believe are a 3 stack of 20a samsung inr batterys

edit: found this
http://www.ereplacementparts.com/battery-holder-p-1753453.html

double edit: I dont think the regulator is in the battery like on the m18