Problem
Warning W 210100 appears in the Omni, with the following text message:
"Battery voltage, battery voltage increased. Recovery not possible at present. Drive carefully, take reduced braking power into account".
Cause
This is a warning message. These are usually temporary in nature, meaning they will disappear either during the drive or at the latest after a restart.
In the vast majority of cases, the error occurs when regenerative braking (engine braking/energy recovery) is used while driving downhill, immediately after starting the descent and with the battery charged to 100%.
Since the battery is fully charged, it cannot absorb regenerative energy. The system voltage briefly exceeds the limit, and the system throttles the regenerative braking power for self-protection.
Erscheint die Warnung bei normaler Fahr, also nicht bergab und mit Rekuperation, kann dies auf ein Problem einer oder mehrere Zellen hinweisen. Im Vergleich zu den restlichen Zellen im Akku weisen diese abweichende Spannungen auf – man spricht von „Cell Drift“.
Solution
Test the battery with the Akku _CHECK.
Sind alle Checkpunkte OK und grün ist der Akku zu 99% in Ordnung.
Wenn nicht, kann ein Kontaktproblem zwischen Akku und Akkufachsockel, ein Problem mit dem Wicket Cable oder im schlimmsten Falle eine „Cell Drift“ vorliegen.
Bei Letzterem muss der Akku an Stromer zur Überprüfung eingesendet werden. In den meisten Fällen liegt ein Akkudefekt vor und der Akku muss ersetzt werden. Eine Alternative ist den Akku mit neuen Zellen zu bestücken. Dies bedingt aber, dass das BMS noch funktioniert, sowie ein Reset des SoH (State of Health) und des Ladezyklenzählers durch den Aufbereiter gemacht werden kann. Ausführlich wird das Thema im Kapitel „Battery conditioning“treated.
My Stromer shows W 210100. What are the next steps for this?
This is a warning message. These are usually temporary in nature, meaning they will disappear either during the drive or at the latest after a restart.
In the vast majority of cases, the error occurs when regenerative braking (engine braking/energy recovery) is used while driving downhill, immediately after starting the descent and with a fully charged battery (100%). The „alarm state“ in „Battery SELF_CHECK“is „nok“ all other flags are „ok“.".
Since the battery is fully charged, it cannot absorb regenerative energy. The system voltage briefly exceeds the limit, and the system throttles the regenerative braking power for self-protection.
If the warning appears repeatedly during normal driving (i.e., not downhill and with regeneration), it may indicate a problem with one or more cells in the battery: there are voltage differences between the cells that the BMS cannot compensate for. This is referred to as „cell drift.“ Usually, a „nok“ will also appear for „Cell Drift“ at„Battery about“visible. Cell drift is irreparable. You either buy a new battery or have it reconditioned.See here).