just got back from a short 21f degree ride and back home. was looking for an excuse to do a short ride with full heated suit blasting.. to test out new Earth-X ETX24, which did an outstanding job. as it took about 75 seconds cranking to start R80G/S. note this was starting from an unheated garage bike exposed to 21f degree for about 15minutes before starting. kept the engine rev's up for all of 10 minutes it took to get there. then another 10min back. these LiFePO4 batteries don't have much in reserve amp hour capacities. ETX24 is a bit smaller than what I'm used to running. but it did an excellent job!!