crwdns2934241:0crwdne2934241:0 S W

crwdns2934249:0crwdne2934249:0:

Yes, it is a lithium CR1620 3V.  You need to disassemble the front and back covers.

https://www.youtube.com/watch?v=MVE5dfXmEEg

Sorry its in Spanish.

crwdns2915684:0crwdne2915684:0:

open