Oldboy
10 W
Found this company that makes an insulated plate that can be bent to weave it between batteries . Has wield on end caps available,they seem to make a lot of different types cooling options for batteries . I'm not very educated on this type of thing but I was guessing if you had the room to weave this stuff between your batteries it could solve a lot of heat problems if heat was one of your problems . Space to use it and extra weight to run it could possibly be the only things that might make it hard to use .but I thought it was very interesting stuff indeed and thought I'd share that's all . Ps I hope Ive posted this in the right area . If not feel free to move .