Im looking to buy a battery for my new trolling motor. Its a vector 40 lb thrust mounted on my canoe. I know I need a deep cycle battery but am not sure the amp hours I should go with. What would you guys recommend?  Maybe just the heaviest one im comfortable lugging around?  

I have not been able to find a decent battery minder that is not mounted in your boat online either, can anyone point me in the right direction with that? Preferably something i can leave hooked up for a week or two if i forget about it in between fishing trips.

One thing I did find that seems like a good purchase at first glance is this trolling battery power center by minn kota.  http://www.boatersworld.com/product/369634514.htm   It has a 50 amp circuit breaker on it which is fairly expensive by itself and if the box is fairly sturdy it seems like a good product.  If anyone has used this product your comments would be appreciated.

I bought one of those boxes from boaters world last season. The circuit breakers, charge indicator and power ports  are great. The best thing is it make it very easier to carry the battery. It is one of the best investment I have made for the boat.

As far as battery size, I would get the biggest you want to carry. A 105 AH may be to big for a canoe. You may want a 75AH for that.

For a battery charger I have one of these I leave on my 75AH battery to charge and keep it charged 24/7.

http://www.battery-rechargeable-charger.com/vector-VEC080-float-charger.html I got it a walmart for $20

A G27 or G29 would probably be too big for your canoe.  A G24 would probably fit best.  They aren't that heavy.  You can get an Everstart at Wal Mart for $45.

As for a charger, I swear by the Schumacher SC-1200A.

thanks for the input.   i dont think i realized what i was getting into when I picked up a little trolling motor im gonna be $600 into this thing before you know it