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Originally Posted by mexiken
When you auto stop, the IMA battery is powering everything thats on.
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I haven't looked at schematics for the HCH, but this makes no sense. The wiring for all the accessories in the car - radio, headlights, gauges, etc., is the same as for every Civic. They are wired to the auxilliary battery.
It's possible that the auxilliary battery gets recharged constantly from the NiMH battery pack, whether the ICE and electric motor are turning or not. I don't know if that's the case, but it would explain what happened to you.
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Originally Posted by mexiken
And yes, the IMA battery has an integrated starter that is used to start the car. However, I DID leave the lights on one day, and so the IMA battery died, and the conventional battery had to start the car. So it does help the IMA starter if need be.
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Well, yes, the hybrid motor is the integrated starter if that's what you want to call it. There is no separate starter motor associated with the IMA. When your car died the auxilliary battery didn't "help the IMA starter". It used a conventional starter motor that exists in the car, and is rarely used. That starter is hooked up to the auxilliary battery as in any other Civic and is independent of the IMA.