One pair of CR2032 button cells case, made of 304 stainless steel with sealing O-ring. 300-500A thick Gold coating inside case by plasma sputtering coater
This is a special CR2032 coin cell case with Aluminum coated on the inside and outside of the positive can (60pcs/pack). It can tolerate polarization of higher voltages (up to 5.5V) due to the passiva