NHTSA Complaint #11585830 — 2021 FORD F-150 HYBRID

Battery drain issue caused by over the air updates causing Low Battery warnings to occur. This issue has been repeatedly looked at and brought to the dealership since purchase. Alternator replaced at dealership. Battery replaced at dealership. Updates forced by dealership, multiple times. Battery minder installed to ensure start during winter months due to constant BMS warnings of 12V Battery State of Charge Low and infotainment Low Power Mode notifications. OTA update currently causing this issue. Attempted to clear by personally, by plugging battery minder in overnight for consecutive nights, prior to booking 40k mile service with dealership. Brought in for service, found battery state of charge reading below 50%. Recovered to above 70%. Requested I let the OTA attempt to complete overnight. OTA has continued to fail for the last 3 days, even while on the battery minder. Vehicle is driven at least 1 hour per day. BMS sensor installed: ML3T-10C652-BA. Due to the power consumption reduction saving functions of the system, low power mode causes functions and features of the vehicle to slowly turn off and support only the driver access when in low power mode. This includes terminating the gateway module that the OTA update is required to verify and validate completion with. This also changes reported settings in the infotainment system to appear as if the driver has deactivated WiFi, causing an inaccurate assessment of issues by technicians. A low enough state of charge, even when inaccurate, can cause the vehicle to fail to start.