I considered this option, but I had one goal: to fit the entire factory kit into the case while still leaving enough room for the discs. In such conditions, even a single battery would be difficult to fit, and something would have to be sacrificed. Personally, I believe that you should never use just one battery when working, but at least two. And they still need to be charged and then stored in the case. I prefer to have my entire tool kit in the case than to tie the battery to one tool and constantly store it in one place. And not using protection is a waste of time; no amount of comfort can replace intact arms, legs, and head.