Trolling Motor powered by lithium ion 18650's?

[johnrobholmes]

Why not build the pack for the proper voltage in the first place? Is there some reason that you cannot do this? 3s would work with the trolling motor just fine, and you would have a higher system efficiency without the use of the DC converters. There won't be much sag to the pack anyway. Do you have a low voltage monitor on the pack planned as well?

No matter what you will be looking at a massive pack construction task. The cell body needs to be supported while keeping the connections flexible. I would suggest building smaller parallel chunks of cells that you can gang together in the case that pack work needs to be done.


Soldering will work, it is really the only choice you have. I would probably get some threaded copper bits and solder them on so that bolt on ring terminals could be used for cell interconnects. I like your idea of doing it the other way with the screw on the cell. Just don't support the cell by these.