In this technical repair video, the creator documents the troubleshooting and restoration of a dead e-bike battery that unexpectedly shut down during a ride. After initial charging attempts failed, he meticulously disassembled the 48-volt battery pack to investigate the issue. Using a multimeter and specialized testing equipment, he discovered a single problematic 18650 lithium-ion cell with abnormal voltage characteristics and high internal resistance that was causing the battery management system (BMS) to cut off power. The video provides a step-by-step demonstration of battery cell testing, removal, and replacement, highlighting the importance of individual cell health in battery pack performance. By carefully removing the defective cell, testing the remaining cells, and spot welding a new cell into place, the creator successfully rebuilt the battery pack, restoring the e-bike’s functionality. The detailed process serves as an educational resource for DIY electronics enthusiasts and electric bike owners, demonstrating advanced battery maintenance and repair techniques.
