The original versions had different electronics and a bypass button that had a red led that would light up when the steps are in the bypass mode. The gen 1 steps are notorious for causing parasitic battery drain issues.
The Gen 2 steps were re-designed, they do have a passive bypass toggle that draws no power and has no indicator lights. And while they do draw a minor (almost nothing) amount of power I have had them installed without any battery issues since July, and my 392 is not a daily driver and maybe gets driven once a week. If your really curious I can measure it for you.
There is really no reason for a 12v bypass, if you think you might not drive for an extended period of time you can always remove the fuse from harness that powers the steps. Its location is right next to where you connect to the battery, super easy to get to.