I have an old 12v 80mm PC Power Supply fan that I use to keep air cirulating over the cells when charging and re-peaking them, makes quite a large difference if you ask me, they are noticably cooler when I have used the fans than when I havent used the fans...
I use an old 1700mAh NICD to power them, it lasts 2 meetings before it needs to be topped up again. I'll be modifying my fan setup to run from my 12v power supply soon, get a little more power from the fan setups.
Might even get some of the LED light 120mm fans for my new setup
Im planning how to temporarily attach heatsinks to the side of the cells when they're being charged, so long as the heatsink is only touching each individual battery bar there shouldnt be any problem with shorting out
Still thinking about that idea, but hopefully it will drag the heat out of the cells..