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I paid 125 a couple years ago for my deep cycle battery and it holds a good charge and has yet to make me have to use my backup battery. It would be heavy in a canoe though as it's at least 30lbsI wish I could help you with that, sorry. The smallest battery I ever used was a standard lawn tractor starting battery in my 13' Smoker Craft. I used it for lights/depth finder and a bit of 27# thrust Minn Kota, never wore it down much and recharged immediately. Discharging and re-charging starting batteries will kill them quick. And now a full size 27 series for the bigger boat/w 55# Minn Kota. The main reason I posted on your thread was so you don't make the same mistakes I did with charging. I used a charger that didn't provide what the batteries needed and got about half the life I should have from two of them.
You may want to look into an AGM (Absorbed glass mat) deep cycle battery seeing as they are a bit lighter than flooded batteries, but $$$. Figure out a way to secure it midships and you wouldn't have a problem with the weight. Your problem is, the longer the running time, the heavier the battery!
Mike