Battery drain in an electric Mercedes-Benz, particularly EQ models, can lead to reduced range, accessory failure, or complete shutdown. AT Technicians provides accurate current draw testing to identify parasitic drains in both 12V and high-voltage systems. We begin with controlled shutdown monitoring, testing current draw after ignition-off periods using precise instruments. We assess high-voltage contactors, residual current in telematics modules, climate pre-conditioning, and software-linked wake-ups that affect battery discharge. Our step-by-step isolation of circuits helps determine whether it’s a module fault, corrupted software, or physical damage causing the draw. For EVs, this could include inverter relays, DC-DC converter faults, or battery control unit anomalies. Once the issue is resolved, we validate with re-testing to confirm balanced power retention. Avoid the frustration of waking up to a drained Mercedes EQ. Book your diagnostic draw test with AT Technicians and ensure system reliability.