Training course on diagnostics and repair of high-voltage batteries for hybrid and electric vehicles
Learn to diagnose and repair high-voltage batteries in hybrid and electric vehicles using MS800 / MS800A and MS801 testers. This online course is designed for automotive electricians, diagnostic technicians and workshop specialists. It covers Ni-MH, Li-ion and LiFePO4 batteries, as well as 48 V mild-hybrid batteries.
How the training works
7 modules, 24 lessons and approximately 14 hours of learning. Study independently at your own pace on academy.msg.equipment. You can study the theory and watch the videos before purchasing a tester; hands-on practice requires access to suitable equipment.
- Text lessons with diagrams, photographs and screenshots of the testers and LogReader software.
- Videos of real workshop procedures: battery removal and opening, module connection, testing and insulation fault tracing.
- Automated quizzes after the lessons.
- Course languages: Russian, Ukrainian, Spanish, Polish, English.
Preparation before starting the course
Before starting the training, you must complete the separate course “Fundamentals of Electrical Engineering and Electronics for Automotive Electricians” — 8 modules and 26 lessons. This course is included in the price of the high-voltage battery training and is provided free of charge, with no additional fee.
It provides basic knowledge of voltage, current, resistance, electrical circuits and measurements. The main battery course does not repeat basic electronics.
Training program
High-voltage battery hazards, protective equipment and workplace preparation, emergencies, vehicle de-energisation and verification of the absence of voltage. Complete this module before any practical work.
Cells and modules, BMS, contactors and cooling; capacity, energy, SOC and SOH; causes of degradation; Ni-MH, Li-ion and LiFePO4 chemistries; series and parallel connections and battery configuration notation.
Symptoms and causes of faults: capacity loss, imbalance, leaks, corroded connections, contactor problems, cooling faults and insulation failures. Moving from symptoms to diagnostic checks.
Videos showing battery removal and opening on the Jaguar I-Pace, BYD Yuan EV360 and BMW X5 45e, plus disassembly of a Hyundai Tucson 48 V battery. Finding the manufacturer’s procedure for a specific vehicle.
Separate methods for Ni-MH, Li-ion and LiFePO4: charging, discharging to measure capacity, and balancing. Causes of imbalance, insulation resistance measurement and leakage fault location.
Complete repair workflows on video: a Lexus CT200h Ni-MH battery and a Nissan Leaf Li-ion battery. From fault diagnosis to replacing damaged modules, balancing and checking the result.
Equipment for practical work
- MS800 or MS800A — capacity testing and balancing of Ni-MH modules and individual Li-ion cells.
- MS801 — diagnostics of Li-ion and LiFePO4 modules, including 48 V batteries: charging, discharging, balancing and internal resistance testing.
- LogReader, an insulation resistance tester, a multimeter with insulated probes, personal protective equipment and insulated tools. Vehicle work also requires a diagnostic scanner and battery removal equipment.
What you will learn
You will learn the diagnostic workflow from safe preparation and battery removal to module testing, report analysis, selection of replacement modules and balancing. This helps you assess when a battery can be repaired by replacing faulty modules instead of replacing the entire pack.
Knowledge checks
Automated quizzes after the lessons help you check your knowledge.