Third Week Results After Tesla BMS a079 Symptoms (Avoiding the Error as Much as Possible)

This experiment is based on a user scenario in which a vehicle that is already out of warranty shows BMS a079 symptoms, and the owner tries to keep using the vehicle as stably as possible while accepting a certain level of inconvenience. This is the third-week result since the first detection of the BMS a079 phenomenon. So far, the BMS a079 error code has not actually occurred.

In last week’s middle graph, the cell voltage deviation widened up to 0.09 V. Starting this week, however, we are managing the battery by limiting the charge level to 60% and keeping the maximum cell voltage around 4.0 V, as shown in the graph on the right.

Although the voltage curve looks thicker due to shorter charging time, the actual cell deviation is stably maintained at around 0.05 V.

We will continue the test while carefully managing the conditions to prevent the error from occurring.