The SmartBoost was offered as a module featuring both the servo/receiver voltage booster and the single cell cut-off; so the 1S cut-off circuitry is 50% of the whole point of this module.
However, things change, and these comments will be taken into consideration. If we need to post a technical update and modify our on-line information in response to these reports, we will add a compatibility disclaimer.
More comments concerning this issue should be collected in this thread.