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Leo B (not verified)    September 26, 2022 - 5:52PM

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Herb and Paul: sorry to dispute your posts but I've experience many (>10, two different Priuses, '05 and '07)) instances when my 12 volt battery was drained and the ICE could not be started, all of which occurred with a perfectly functioning traction HV battery. You may be correct that you need the HV battery to start the ICE, but likewise you need a charged 12 V battery as well. I'll leave it to an expert to explain-perhaps the 12volt battery delivers a voltage signal through the ignition circuit that engages the motor powered by the HV battery to start the ICE?

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