The last few times I went out in my canoe/boat I used oars.  My battery hasn't been charged in a couple of months.  I may take the TM out this afternoon so I threw the optima blue top on the charger.  It was at 70%!!!.

Man this sucker holds a charge.

Expensive batteries fer sure, but I have dropped it on the driveway, left it in my truck with temps over 100 degrees, and other things neglectful, lazy, and stupid, yet my optima keeps on keeping on.

I couldnt agree more, I usta run the surf w/ a pick-up and slide in camper, I ran dual Op's in the truck and a set of duals for the camper that would charge under the alternator, I could sit for days on end under battery power and never ever worry about cranking the truck over.  I run a DieHard Marine battery for my TM and I havta say it's never let me down.