I personally consider this setting as useless, so would rather remove it completely. If you find it useful/important you might want to inform support that you never removed the battery and its still gone.
I asked FP to officially explain the set-up of this feature in a blog post or similar as there are some conditions programmed in the background, like e.g.
One such criteria is that user can remove and install battery within the first 7 days after activating the phone to allow user to install a SIM and battery health will not be affected.