[Shop-talk] source of "S" type battery connectors?

[Obaa]

I'm trying to standardize the connectors across all my different battery
tenders/chargers, extension cables, etc.  The latest two that I bought have
connectors that I believe are the "S" type battery connectors that they use on
kids battery powered ride-on toys; I'd like to standarize on these since they
seem to be the current standard.
Is there an alternate name for these things?  I tried looking at digi-key,
which did not turn up anything, and a simple google just finds batteries for
sale.
 
Thanks,
Mike