Audi E5 Suffers Sudden Battery Drop at High Speed; Owner Questions Range Claims, Manufacturer Cites Charging and Driving Conditions

Recently, Ms. Lin experienced a sudden drop in battery level—from 15% to 0%—while driving her SAIC Audi E5 on the highway. The authorized dealership initially attributed the issue to the characteristics of lithium iron phosphate (LFP) batteries and improper charging practices by the owner. They first advised her to perform a full slow charge once a week, later revising this recommendation to once a month. Ms. Lin stated that although the vehicle’s official rated range is 618 kilometers, in real-world usage she could only travel just over 200 kilometers from a full charge down to 30%, resulting in an actual total range of approximately 300 kilometers. During her efforts to seek redress, Ms. Lin claimed her multiple requests were repeatedly dismissed. She also mentioned being told the vehicle had “battery capacity locking” restrictions, though she did not retain audio evidence of this conversation. She requested driving data from the manufacturer covering the period of the incident. Initially, the manufacturer refused, citing automatic data deletion, but eventually provided a 50-second data clip. The manufacturer’s after-sales manager explained that LFP battery-equipped vehicles require a monthly full slow charge (to 100%) to calibrate the battery accurately, and that the car features OTA reminders for this purpose. According to backend records, the owner exclusively used fast charging and never performed a full slow charge; prolonged adherence to this practice could lead to inaccurate state-of-charge readings. The manufacturer clarified there is no “battery locking” implemented via backend systems. The previous instance where charging stopped at 92% was due to high temperatures at a third-party charging station. Regarding the abrupt battery drop, the manufacturer reviewed data showing the charge level decreased gradually from 55% to 2%—not instantly to zero—but acknowledged the decline occurred relatively quickly. On the issue of reduced driving range, the manufacturer noted it could be influenced by driving habits, vehicle load, and road conditions, and offered to arrange for a dealership technician to accompany Ms. Lin on an on-site test drive.