FAQ: SBM in the disconnect state – what to do?
Question: After discharging a battery pack there is no voltage on the output of the SBM. The battery pack is OK, but the SBM does not give any voltage on the output pins (P+ and P-). What is wrong?
The protective function of the SBM will disconnect the battery pack output. In some conditions (especially if the pack is deeply discharged) the SBM will stay disconnected to protect the battery. The SBM stays disconnected until the pack is recharged again.
Check these solutions to restore the operation of the SBM:
Note: in same cases a completely new SBM can be in the “disconnect state” right after installation. You can resume the function the same way as explained above.