Abstract: An electrochemical cell thermal testing fixture and related apparatus are provided for connection to a battery cycler. The thermal testing fixture comprises a temperature-controlled plate configured to contact a surface of a cylindrical electrochemical cell, and a cell stand, comprising positive and negative contacts, configured to receive the cell. In some examples, the negative contact is configured to contact the sidewall of a cylindrical cell. An electrochemical cell thermal testing fixture system is also provided, comprising a plurality of individually controlled thermal testing fixtures coupled together.