Are your batteries cooking? Do you need to let that battery cool a while and take a different battery?
Using a lead acid battery over 40°C damages the battery and reduces its lifespan (37°C for VRLA/Gel).
A good rule to remember is that for every 10 degrees over 40°C the battery cycle life halves; therefore if the average lifetime temperature of a battery with a 1500 cycle life is 50°C it will only deliver 750 cycles.
With its bright orange LED showing the battery is overtemperature use the Smart Blinky Temperature Monitor to always know when your battery is too hot to use.