Yes they are unique and configured in a pack to fit in an arc to match the outside shape.
Takes 30 minutes to go from zero to fully charged.
The biēm’s charge lasts anywhere from an estimated one week (for a typical family of 4 with each person using it at every meal), to six weeks (for a single person). The biem comes with a battery pack that is 4AA equivalent, high-density Lithium
If you were to spray consistently, without stopping it is designed to be able to spray 5-6 sticks of butter before needing another charge.