I fish a ton of kayak bass tournaments and 12v power is key to increase the range (e-motor), power lights, fish finders, etc. It's a massively growing sport and we all use lithium these days.

Several friends have either a minnkota or motorguide 55lb motor mounted to the bow. These have GPS and spotlock built so the power draw is not small. Most anglers have one of these two brands. (Amped Outdoors or Dakota Lithium) 100ah battery and it will last them 8-10hr day of fishing. They weigh just 32-35lbs.

I have a different motor setup but use Dakota Lithium 54ah to power my lights and electronics for the past 4 years. Super happy with them.