BYD Atto 3 12V auxiliary battery drain — software fix
BYD
Atto 3
2022
Safe to Drive?
🚫 Do NOT Drive
Urgency Level
🟢 Low Priority
The 12V lead-acid auxiliary battery drains overnight leaving the vehicle unable to start the next morning. This is caused by certain vehicle systems remaining active after the vehicle is locked. BYD issued a software OTA update that significantly reduces the parasitic drain. Ensure the vehicle has received all available software updates. As a temporary measure, a battery conditioner/trickle charger connected overnight prevents the drain.
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