Does a passive BMS overly drain a lithium-ion battery when left idle?

About a year and a half ago, I made an 11.1v battery pack with a 3.7v Li-ion battery in a 3s 7p configuration. After idle, the passive BMS seems to drain the battery. Can I try to restore the battery?

Yes, when idle, the Passive BMS can drain the lithium-ion battery.

  1. A passive BMS is powered by a battery, and a good BMS draws on the order of 1 to 10 μA from the battery cell.
  2. A poorly designed BMS may draw 1-10 mA, which is sure to overdischarge the lithium-ion battery in a relatively short period of time.

Furthermore, recovering the battery becomes challenging if its voltage drops below 2.5 volts. If the battery is fine, a new BMS can help.

MORE: Will BMS shut down when BMS SOC is high?

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