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S Kq (not verified)    November 6, 2021 - 2:18PM

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Bad idea. 12V is charged via DC-DC converter from HV system. "couple minutes" per day is not enough as you have discovered.

If you intend to leave the car parked, remove the 12V and put it on a battery tender that will maintain it at full charge.

More importantly, you should get the car diagnosed, so you know what's needed. Red triangle of death and accompanying lights can indicate dozens of possible issues.

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