Examples are disclosed herein that relate to identifying batteries of different chemistries such as in a battery recycling stream. One example provides a method for differentiating between batteries of different chemistries, the method comprising determining an expected mass of a sample of one or more batteries based upon an expected chemistry of the sample of one or more batteries, weighing the sample of one or more batteries to determine a sample mass, comparing the sample mass to the expected mass, and if the sample mass does not match the expected mass within a threshold range, then determining that the sample contains one or more batteries of a different chemistry than the expected chemistry.