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Does persistent cell imbalance == module issue?

jpsd

Member
Mar 12, 2021
5
0
USA
According to ScanMyTesla, one of my HV battery modules is always 4-10mV under the rest of the pack.

Could this indicate an issue (e.g., Condition X or Z)?

Other potentially relevant data:
- 2013 Model S 85kwh
- 98,000 miles
- Original battery
- PN 1014114-00-B
 

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jpsd

Member
Mar 12, 2021
5
0
USA
Module 2, String 1 is always low on mine. Average about 10-20 mv low when at rest.

2015 with 40k, almost never out of chill mode.

Suspect a bad cell as one out of 74 would drop the voltage by about 50mv.
Yes, could be a few bad cells. Do bad cells drop out entirely, partially, or both?

All six strings of Module 7 and two strings of Module 10 run 4-10mV under the rest of the pack.
 

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