No one else has said it, so here it goes. Small lake, small boat. What's wrong with oars?
http://www.canadiantire.ca/AST/brows....jsp?locale=en
That model of battery and a minn kota 30lb kicker pushed my 11' tin can(2 people + gear) around many lakes back in BC. It would last most of the day, but started to die after 8hrs or so.
If you want to downsize and troll all day well I'm afraid you're probably SOL on that one. However, I'd recomend going with a AGM battery in the size you're looking for and use it only when necessary. Get a rod holder for the pontoon and use the oars knowing you got that little kicker there to get you back home at the end of the day.
Or give Chevron a call. They own a patent on a battery technology that is worlds ahead of what's in production today.
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