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post #1 of 38 (permalink) Old 01-22-2019, 05:21 PM Thread Starter
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12V Battery dead on 2017 XSE

I had to have a boost to get the car going today. i got in the car and nothing worked, no lights, horn, no instrument panel. So i tried hooking a battery pack that you use to boost ICE cars and nothing happened. I left it connected for 30 minutes and nothing. My neighbor offered a boost and my car immediately worked after the boost. Lucky the boost point is under the hood, because the hatch cannot be opened if the battery is dead unless you crawl inside and release it manually after you remove a small panel.

I can't figure out why the battery pack didn't work. It was fully charged and I had used it to start a friend's 2009 Sienna just a short time ago.

Next stop is the dealer to find out the condition of the 12V battery.

Last edited by swampboy; 01-22-2019 at 06:18 PM. Reason: clarification
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post #2 of 38 (permalink) Old 01-22-2019, 05:33 PM
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I can't figure out why the battery didn't work. It was fully charged and I had used it to start a friend's 2009 Sienna just a short time ago.
You killed it. The HV 12v batt is not capable of jump starting another car. You're lucky you didn't fry something. Get a new 12 battery, but be ready to get gouged at the dealer. Just be sure its the correct type with a venting tube fitting.

Now you know why you're not supposed to use jumpers on a HV.

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post #3 of 38 (permalink) Old 01-22-2019, 06:17 PM Thread Starter
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I should have worded it better. I meant my battery pack, not the 12V battery in the RAV4. I still can't figure how it did not work at the boost terminal under the hood.
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post #4 of 38 (permalink) Old 01-22-2019, 08:39 PM
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By the sound of it to me, he didn’t try boost anyone. The battery was just dead one day. A charger didn’t work so he had HIS car boosted and then it ran fine.

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post #5 of 38 (permalink) Old 01-22-2019, 10:26 PM
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Ok, well batteries fail for no reason some times, plates come loose, etc. In any case I would replace it, wonder if its covered under warranty?

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post #6 of 38 (permalink) Old 02-11-2019, 04:28 PM
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I have a 2017 XLE pre-owned certified from the dealer. They had to jump the battery because it was sitting in the showroom for a while. They gave it to me, and within a week, my cranks got slower and slower, to the point where I was concerned about not getting it started one day. So I called the dealer. I had jumpers and a booster with me just in case I need them. I didn't. But I took it in, and they ran a test with codes on it, and finally got it to "fail." It was still under the original factory warranty and certified warranty. So I got a free battery. I think it should have been free regardless of a warranty since it sat in their dealership for weeks/months(?) before I got it, and wasn't responsible for the dying battery. But anyway, win/win. As a precaution, I make sure to turn off the radio and any lights that are on (headlights/internal lights) before shutting it down.
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post #7 of 38 (permalink) Old 03-04-2019, 12:48 PM
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Can someone clarify for me here? The hybrid cars have another battery that dies and you need to replace?

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post #8 of 38 (permalink) Old 03-04-2019, 01:03 PM
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Can someone clarify for me here? The hybrid cars have another battery that dies and you need to replace?
Have you read the owner's manual? Yes, there's a 12Volt battery under the deck board in the cargo ares, it can be run down or die and need charging or replacing, it provides power for hardware/electronics(ECUs) that needs power before starting even though it doesn't provide power to start the ICE, if the 12V battery is dead, the system won't srtart, this is detailed in the owner's manual.

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post #9 of 38 (permalink) Old 03-04-2019, 01:18 PM
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Ah I see, thanks for clarifying. What part number is that battery? I'm wondering how much an aftermarket replacement is?

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post #10 of 38 (permalink) Old 03-04-2019, 01:26 PM
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It's a vented AGM battery, I priced one for our '15 Prius at $130, but since it never needed to be replace, I never bought one, I think most Prius Chat owners went with aftermarket batteries, OEM HV 12V batteries are $165-$220.

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