How to Manually Bypass the Discharge MOSFET in a BMS Circuit

When a battery pack shows 0V across its P+ and P− terminals despite having good cell voltage, it's possible the discharge MOSFET is disabled due to protection lockout. In such cases, temporarily bypassing the MOSFET can help "wake up" the BMS.     1. Why Bypassing the Discharge FET Works The discharge MOSFET controls current flow to external loads. If the BMS controller detects a fault (e.g., undervoltage), it shuts off the gate signal, keeping the FET off and output voltage at 0V. A brief manual connection between P− and B− can restore normal state. P−: BMS output ground controlled by discharge FET B−: Main battery ground connected to cell negative terminal P+: Positive terminal (usually directly connected to B+)     2. Step-by-Step Bypass Test Set your multimeter to DC voltage mode. Measure voltage across P+ and P−. If 0V, proceed to the next step. Using an insulated wire or test lead, briefly connect P− t...