I use a blower fan to keep my Redshift battery cool during supermoto races and I'll spray water onto the battery with a spray bottle. works ok as long a long as I'm not racing back to back races. Another trick Andy Dibrino taught me was to use a mix of water and alcohol to cool the battery, I think I'm using 80% water and 20% alcohol or 50/50. When the alcohol evaporates it has a cooling effect.