@wongl73 some of this will depend on where you reside. A lot of these places do not ship batteries. Anyhow, the battery for your Samsung SM-W620 should be a EB-BW627ABA. This battery seems to be sold out at many places. Compatible batteries are
EB-BW627ABE
GH43-04711A
GH43-04720A
and those are still available at quite a few places. Again, remember that not everybody does the shipping of batteries to all places.