CUSTOMER CONCERN The high-voltage battery warning is illuminated and the energy-management module stores fault 8526361 / B1802 F1 [008]. CAUSE The high-voltage battery was confirmed failed, triggering the battery warning and stored energy-management fault. CORRECTION Remove and replace the failed high-voltage battery assembly, clear fault 8526361 / B1802 F1 [008], and verify the high-voltage warning remains off and the hybrid system operates normally.