The Battery Capacity Analyzer is a modular diagnostics equipment for EV HV batteries, that can test batteries of vehicles such as Nissan Leaf, Renault Zoe, Tesla, etc. It tests the main components to detect faults of electronic parts such as the BMS and electromechanical components, individual cells and tests the capacity with little intervention on the vehicle. In the end, it produces a certificate with the known faults and the state of health (SOH) relative to a new battery. For this last, it makes a deep discharge (within a safe margin) to test the REAL capacity of the battery. It can also be used as a diagnostics equipment and one can check important parameters and analyse the final graph throughany point of interest.