In this technical repair video, the creator documents the process of troubleshooting a non-functioning electric bike battery that unexpectedly shut down during a ride. After initial charging attempts failed, he systematically investigates the battery pack, discovering that a single faulty 18650 cell was causing the entire battery management system (BMS) to cut off power. Using specialized equipment like a multimeter and spot welder, he carefully disassembles the 48-volt battery pack, tests individual cells, and identifies the problematic cell through detailed voltage and internal resistance measurements. The defective cell exhibited unusual charging behavior and high internal resistance, indicating it was essentially ‘garbage’. The creator then methodically removes the bad cell, replaces it with a new one, spot welds the connections, and rebuilds the battery pack, ensuring all cells are balanced and functioning correctly. The video provides an in-depth look at battery diagnostics, cell replacement techniques, and the importance of maintaining electric vehicle battery health, offering valuable insights for DIY enthusiasts and electric bike owners facing similar battery issues.
