Is an embedded processor with A/D and EEPROM storage. Its purpose in life is to be a BMS, but obviously with a few variable changes (e.g., min/max voltage and temperature) one can turn the thing into something akin to thermite. Not certain how much EEPROM is inboard but it could certainly be enough to deliver a bootstrap payload to the OS assuming there are vulnerabilities in the code that reads data from the MCU.