Just one note that i dont think was mentioned. After charging, the batteries keep generating heat for up to 30 mins after the charger has been disconnected. I would strongly advice against putting the battery into any type of storage container for up to 1 hr to ensure the batteries chemical reaction has finished.

The charge in a rechargable battery comes from this chemical reaction... an example of this can be as: my charger is set to 47 degrees temperature cut out, my charger sensors this temp and shuts down the charger. After about 5 mins the pack temp can be upto 58 degree.... mmm up by 11 degrees.
Outside cooling ie: fans should not be used to cool the battery as this only gives a false temp reading on the outside of the battery. The temperature is generated from within, thus this can lead to problems.