If the voltage is below 2V, the internal structure of lithium battery will be damaged, and the battery life will be affected. Root cause 1: High self-discharge, which causes low voltage. Solution: Charg. Root cause 1: Detecting equipment differences. If the detection accuracy is not enough or the contact resistance cannot be eliminated, it will show that the internal resistance is too. Case 1: Lithium battery expands when charging. When charging lithium battery, it will naturally e. Root cause 1: Incorrect spot welding location. Solution: The correct spot welding position should be at the bottom or marked “A” or “-” side. Unmarked sides and large surface can't be. Root cause 1: Overcharge If the protection circuit or the detection cabinet is out of control, the charging voltage will be greater than 5V, causing the electrolyte decomposition, vi.