I have my boat dry docked locally at the lake with the charger on for the lead acid batteries. I was thinking of switching to a single 24v LiIon for the Ultrex 24v motor to save space and weight. From everything I read, the max charging temperature would be 114 degrees. This would be too low for some of the hot summer days in the Phoenix area when the battery compartment could reach 118+. Any suggestions?