You'll be deep cycling the battery, so... deep cycle it is.
A long day's fishing with LS+head is about 40 Ah!
I run a 50 Ah lithium, lasts almost 2 whole days with 102sv + GLS10. I started out using a wheelchair-type AGM 35Ah that worked well *, but it doesn't quite make a whole day - the LS sucks it right down by the afternoon unless you were diligent about turning it off when not at the bow.
* my units are connected directly to the battery with no extensions to the power cords. My experiences and opinion only. Yes, I'm an EE.
"Alive without breath, as cold as death; never thirsty, ever drinking, all in mail never clinking."