@Mike, what do you power your Garmin Striker 4 with? How long does it last on the battery you use?
I no longer have the Striker, I recently sold it along with my old PA... I now have a Lowrance 3 in 1 in the new kayak.
Saying this, I used my Striker for 3 years with absolutely no issues. I used a 9ah DiaMec. I think the Striker 4 uses less than .5ah, this means that the battery would get you 18+ hours of use. I charged the battery after every outing and it never died on me.
Here is a link to a 9ah battery... the battery and charger will cost you $33.98. You will need to make a waterproof box for it (you can find several youtube videos on how to do this)
https://www.amazon.com/Mighty-Max-B...th+charger&qid=1583339614&sr=8-9This 10ah Lithium battery is much smaller and has waterproof connections... However, it's $137
https://www.mariner-sails.com/hobie-lithium-pro-power-kit-12v-10ah.htmlBudget permitting, I would go with the Lithium. They are much smaller and will last longer.
Good luck with your search. The searching/researching is part of the fun!