1. it is necessary to calculate the thickness of the wire in two rows on the right and left (the length of the finished product is about 10-12 cm) under one sausage, taking into account the fact that the wire must be hot to red and fry the sausage in 2-3 minutes
2. What should be the battery for this business?
ideally, this format is Li-Ion 18650, 3.7V, 3000 mAh, several pieces
or from UPS 6 or 12V, preferably not more than 1 kg, charging should be enough for at least 10 min
3. maybe you need some kind of electronic Battery protection, which one?