I am looking for help in my effort to identify a SMD on the circuit board of a key fob. The SMD is the one located on the lower right in the image. The large copper pad on the very bottom right connects to the +3v side of the lithium coin cell in the fob. To the left of the copper pad is the spring loaded connector that connects the circuit to the negative side of the lithium coin cell battery. From my limited knowledge derived from a couple semesters of electronics nearly 40 years ago, I am guessing that it is a diode to protect the circuit from a reverse polarity situation but that is just sheer speculation at this point. I was hoping that someone with a much greater depth of knowledge would impart some of their wisdom to me, if it is glaringly obvious as to what this SMD is.