Earlier this week, some Tesla owners said their 12V lithium-ion battery would malfunction when their vehicle's main battery was in a low-charge state (SOC). The problem is caused by lithium iron phosphate (LFP) batteries not being properly calibrated, which causes the computer to think it's actually empty while there's still some energy left in it.
The solution suggested under Tesla's internal service memo is to simply charge the LFP battery to 100% to properly calibrate it.
The issue also caught musk's attention, who said Tuesday that Tesla was "investigating" the incident. Now, they seem to have found a simple but effective way to prevent this from happening by automatically adjusting the charging limit of some cars to 100%.
Tesla is currently using the vehicle's alert system to send in-car notifications to alert owners to the change: "To perform battery calibration, the charging limit in your vehicle has been automatically adjusted to 100%, charge your vehicle as early as possible until it says 'Charging Complete' to maximize the performance of the battery." ”