You need a batter that in the UK seems to be called a "leisure battery", over here in the US it's known as a deep cycle marine battery. Unlike an ordinary car battery, a deep cycle battery can withstand prolonged current draw and deep discharge/recharge cycles without failing. Car batteries are built for quick bursts of power, followed by an immediate recharge. A car battery will quickly be killed by an electric outboard.
Next what you need to determine is the amp hour rating. More amp hours means that the battery can deliver more current for a longer duration. In other words it will last longer.
How many AHrs do you need? It depends. Small lakes, shorter sessions like fishing half days, evenings, etc, and if you have a petrol outboard to get you to the fishing spot, you could easily get by with 85 to 100 AHr. Long days, big, wind-prone lakes, using the elecric for long runs to the fishing spot, etc, are going to be harder on a battery. 120 AHr is the way to go when it comes to heavy use. Just keep in mind, a 120 AHr is a big heavy battery.
The tradeoff with AHr ratings is a higher rating means a bigger and heavier battery. I'd think that's the reason why NCA uses two smaller batteries, it would certainly be easier to carry two 85 AHr batteries rather than one 120 AHr.
Don't forget, you also need a high quality battery charger.
Grouse
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