Aux battery and the drive battery draw limit

1bnna2bnna3bnna | 2025-05-18 08:49 | 11 views

I found out the hard way this morning that if your drive battery falls below 10% it won't feed the auxiliary battery to charge. A quick call to BYD Roadside Assistance and they showed me the door button trick to override and fire up the car 👌

Comments (9)

RennieAsh 2025-05-18 08:55

uh...

UnfortunatelySimple 2025-05-18 08:55

I'm not sure I understand your word salad.

red_dragin 2025-05-18 09:06

Once the main battery drops below 10%, it stops charging the 12v auxiliary battery. That runs the dash etc. Car may get grumpy or go to sleep. Pushing the door button five times quickly will wake it up. Couldn't follow it very well either, but it's been discussed before so pieced it together.

UnfortunatelySimple 2025-05-18 09:07

Thanks, mate, that premium membership worth it?

red_dragin 2025-05-18 09:10

Nah, means Seal Premium (what I've got)

UnfortunatelySimple 2025-05-18 09:15

Ah, my bad, that makes sense.

1bnna2bnna3bnna 2025-05-18 09:36

Speech to text on the bus without my glasses. Fixed.

xxx_ 2025-05-18 20:36

You fix says if the 12v battery drops below 10% it won't get topped up by the HV battery.... you sure its not the other way around?

SexyDraenei 2025-05-26 23:56

Seems silly, but I have seen multiple reports of people driving with low SOC and the car just going dead. I think if your 12v is on its way out and then it stops the DC-DC then you are up shit creek.

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