... stands they tend not to , especially not on this small scale (AA batteries) however, I do believe that the hotter the water in the bath , the more significant the change in efficiency within the battery. As molecules in a battery obtain motion through kinetic energy (a consequence of heat energy) , the movement of the electrons within the battery slows down. Brownian motion dictate that more reaction will occur the more electrons produced (Brownian movement or motion, zigzag, irregular motion)As these reactions take place the friction within the battery will cause heat, this heat will become insulated and conducted by the water around it. This will cause internal resistance to rise also, to the point where the battery become too hot and unable to function properly. Here I cannot predict the pattern of the internal resistance but can say that the efficiency of the battery will decrease. ...

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