Proterra SPAC Presentation Deck

PROTERRA TECHNOLOGY Battery System: Vertically Integrated Development and Manufacturing Enhances Performance and Lowers Cost World-Class Cell Supply ● April 8, 2021 3rd Party Cells Small Format Cylindrical Cells ~2 GWh contract secures cell supply from 2020 to 2022 In-house cycle testing, safety testing, modeling, and algorithm development Plan to co-invest in cell manufacturing capacity Deep Vertical Integration Approach Engineered, Validated and Manufactured by Proterra in California Module Highly Integrated Thermal and Structural Architecture Liquid cooled module beams make-up entirety of internal pack structure Capable of impact energy absorption Cell fusing & interconnection made via high-speed fiber laser processing . · · • Battery Pack Flexible Battery Management System Functional safety certified (ISO 26262) battery management system developed with strategic partner Flexible software and hardware architecture enables up to 1200 V strings Patented thermal event mitigation Ruggedized enclosure • Energy System Seamless Software Integration PROTERRA Internally-developed software, vehicle control unit, charge controller, and telemetry gateway Advanced system enables seamless integration of batteries and powertrains into partner vehicles Capable of over-the-air software flash updates 44

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