Battery Tender?

[P.W.]

Hello all,
Since this is our first bike.... ever a 2019 RTL can someone point me in the right direction to a GOOD battery tender?

Also, There appears to be a plugin of some kind behind the left front tire.....I was told it was for a tender.... but I'm not 100% sure....can someone confirm that for me?

Thanks in advance,
P.W.