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Originally Posted by Tochatihu
Kuroyama, your diagnosis is almost certainly correct. The Prius high-voltage battery cannot be discharged in this way. My only concern is that typically, once lead acid batteries are fully discharged, they have lost some capacity. If the problem does recur you should consider replacing that battery. It is sometimes possible to convince a Toyota shop to replace a 12 v battery under warranty, if your diplomatic skills are good.
DAS
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I left my key on ignition with headon light on overnight because the engine didn't come on. I didn't know until next afternoon. The auxillary battery was completely drained. I used my battery charger to charge it and it was fine. About a year later, the auxillary battery couldn't charge any more. I took it to the dealer's service dept. and they told me one of the cell was dead. Leaving lighton overnight might have killed the auxillary battery. If I didn't have any warranty, I could have pay $120.00 for bateyr with installed.