Trolling Motor powered by lithium ion 18650's?

[captanabolic]

Hello All
I am also looking into some alternate battery power for my TORQEEDO 801 I need to come up with a pack maybe some of you battery guys can help me come up with a solution:
Motor specs:
http://www.torqeedo.com/uploads/medi...english_07.pdf

LIMA high-performance battery with integrated display of charging state,
300 Wh, 29.6 V, for use with BaseTravel 801

replacements go for about $500. the newer models have a 480 Wh (Watt Hour?) Lithium magnese (LIMA) any suggestions or improvements would be greatly appreciated. I have a adapter that allows me to use 2 12v marine cells. (heavy) My goal would be to make a 10 pound batt. their batt is 7.7 pounds.