Merlin Battery Bam

Had to take my system apart. Been thinking if I want the Bam back in or not. For you that have VSM's, with the bam, I ask for your thoughts. Yes I know what Bobby said at the CES about 20yrs ago, and again at his factory when I took them there for re- soldier. If I put it back in, how often do you change batteries and what is the largest mAh you can have? Thank you very much for your input.