This question is better put to LeCig.
I assume that you are referring to
these MEGA cartomizers* for the PigCig. The LeCig site does claim that they are compatible with 808D-1
batteries from other suppliers ... but I have found that often there are subtle differences among batts and cartos that prevent functioning. [Sometimes it is because the center post doesn't make a good contact.]
I also assume that your manual Kr8 battery is functional (i.e., works with other Kr8 cartos).
If my assumptions are correct, then I do not understand why those cartos don't work on your manual Kr8 batts (other than for those inter-brand compatibility problems I noted). Perhaps there is something about those PigCig Mega cartos that makes them compatible with the
PigCig manual battery, but not with standard Kr8 manual batteries. It appears that most D1 (i.e., Kr8) batteries sold by LeCig (all but the manual PT) are automatic. Maybe the website's claim of compatibility with Kr8 batts
assumes that they are
automatic Kr8 batts.
Again, check with LeCig.