We have a 12 ft porta bote and 36# thrust motor. we use a deep-cycle marine battery i got from Costco. It is pretty heavy. I sit on the aft seat and to one side so I can control the center mounted motor. I place the battery on the floor just forward of the transom and just past center opposite of where I sit. So, we are all comfortable and balanced. I keep the battery in one of the plastic battery boxes with the wing bolt terminals. I have not felt the need to put anything under the battery box. I also have a "Fish finder on a stick" mounted on the transom on the battery side of the boat. It is visible when sitting or trolling but not very useful when making any way -- to easy to get off course while looking at it.
Dave
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