Okay fishing gods and goddesses!!!

Going to buying an inflatable boat from Sea Eagle this coming spring (Sea Eagle 9 as a matter of fact.) Now for the problem!!!

I am thinking of purchasing a small electric motor for tooling around on the local lake. I am only planning on using it for a while at least on a local lake that is maybe 600 yards long at its longest point, and maybe 100 yards across. I am only going to be using it for nice getaways with the 11 year old for bluegill and bass. So I am not really going to be using the motor a lot. I am really just going to be using this to get me off the bank, then stop and fish!

So my question is this, with a simple 30 lbs thrust 12 Volt elec motor, for my uses, do I really need a Marine Grade Battery with a price of $100??? Or could I be getting away with using a "standard" 12 Volt battery???

I know that the deep cycle battery would give me more charge discharge cycles before having to be scrapped, but am I really needing that?

Thanks,

Reg