FF Battery Connector Q

An auxiliary kayak I bought came with a Lowrance Hook FF and a battery but no charger and I need to get a charger for it.

The connector is different than the one on my other kayak and so I'm a little clueless here. What's this connector called? What's a good charger for it?

See pics. Suggestions?

Looks like an
RCA jack

I have the exact same battery.  I wonder if you could call and just get a charger.

https://www.ebay.com/itm/151516156767?chn=ps&norover=1&mkevt=1&mkrid=711-166974-028196-7&mkcid=2&mkscid=101&itemid=151516156767&targetid=2274564709393&device=c&mktype=pla_with_promotion&googleloc=9032109&poi=&campaignid=22111556764&mkgroupid=178916887651&rlsatarget=pla-2274564709393&abcId=10160289&merchantid=6586314&geoid=9032109&gad_source=1&gad_campaignid=22111556764&gbraid=0AAAAAD_QDh_mee3IbMH3nq8s8vHnteZbX&gclid=EAIaIQobChMI2vXus6r1kwMViCGtBh33aRJQEAQYASABEgIXmPD_BwE

https://www.mariner-sails.com/7ah-waterproof-ip67-rated-lithium-battery-charger.html

I have the exact same battery.  I wonder if you could call and just get a charger.

Ah, here we go, thanks for the lead!

https://www.mariner-sails.com/2a-wall-charger.html?gad_source=1&gad_campaignid=23337988983&gbraid=0AAAAADAwuoHhUoJK_xUCfYTVkUfjjIkim&gclid=CjwKCAjwwdbPBhBgEiwAxBRA4d_0jQqUBxAyHhyEIA2yGgr4uBHwhf7yYPURVQg6MnqwzS-XVuZciRoCvuoQAvD_BwE

James