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#1 (permalink) Old 01-18-2008, 06:19 PM
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Default battery died

My Prius is about 2 months old, a 2008, with package 7.
I left it at the airport for 6 days when traveling, came back the other day to find the battery dead. I needed to get a jumpstart.

I did not leave any lights, etc on. When I called the dealership, they did not sound surprised, and attributed it to the "onboard computer" which will continuously drain power from the battery.

What gives? Do I really have to expect to start the car every few days so the batter does not keep dying on me? Is this typical?
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#2 (permalink) Old 01-18-2008, 06:30 PM
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Default Re: battery died

The dealership gave you bad info. The computer will not run down the battery in such a short period of time. I've left mine for several weeks and it started right up. The most suspect cause of the battery going dead is a light left on (interior or exterior). Make sure the light in the cargo area is set to off or auto and not in the on position. With the cargo shade closed, it's very easy to miss that light being on. Some people recommend turning off the SKS system when leaving the car for an extended period. It can't hurt, but I have never done it. I leave mine on all the time. Also make sure you lock the car. If a door is not closed tight, the car won't lock, and with a door ajar, an interior light will be on.
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#3 (permalink) Old 01-18-2008, 07:00 PM
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Default Re: battery died

[quote="My Prius is about 2 months old, a 2008, with package 7.
I left it at the airport for 6 days when traveling, came back the other day to find the battery dead. I needed to get a jumpstart.

I did not leave any lights, etc on. When I called the dealership, they did not sound surprised, and attributed it to the "onboard computer" which will continuously drain power from the battery.

What gives? Do I really have to expect to start the car every few days so the batter does not keep dying on me? Is this typical?[/quote]

tomer,

I believe, the dealer meant to say the "Security Key Less Entry and Start" for short: SKS.
It is part of the feature with in the computer but you can disconnect it when leaving the vehicle parked and locked for an extended time. The SKS emits signals and comunicating with your "Fob" at all the time. So it is draining the energy out of the smaller battery. You can disconnect the energy consuming SKS feature by _Depressing a small button" underneath the
steering right next to the TPMS tire pressure monitor reset button.

This should take care of your small battery energy drainage. You better check the state of charge of the Aux battery or the smaller one. It may not have a full charge, I have experienced in my previous Prius that I can go for weeks without any problem.

Toyota Hybrid Vehicles, To make the World a better place to live
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#4 (permalink) Old 02-29-2008, 06:03 AM
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Default Re: battery died

I concur with the others regarding turning off the SKS when leaving the Prius unused for several days.

But, all said, consider yourself lucky. I had similar experience, but the battery was so dead it wouldn't accept a jump. I had to tow the car to the dealóbut just getting the car TO the tow truck was a nightmare I'll never forget (long, narrow driveway, too big for the truck). It took an entire day.

So, be vigilante about the lights, turn off the SKS and count yourself fortunate, all things considered.
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#5 (permalink) Old 02-29-2008, 12:03 PM
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Default Re: battery died

Quote:
Originally Posted by marlowe7
I concur with the others regarding turning off the SKS when leaving the Prius unused for several days.
I had my Prius for several years and never turned off the SKS. I left it for days to weeks at a time without any issue at all with the battery (both at airports and at home). I think it is highly unlikely that the SKS alone (without any other drain or issue) would drain the 12V battery to the point of needing a jump.
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#6 (permalink) Old 02-29-2008, 04:00 PM
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Default Re: battery died

I concur with redwein. I never turn the SKS off.
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#7 (permalink) Old 03-13-2008, 01:55 AM
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Default Re: battery died

Just had the same thing today with my wife driving the car. She had parked the car for about an hour. She called "roadside assistance" and the car was jump started and all OK. The mechanic said "What did you leave on?" Naturally she said "Nothing" as she believed this to be the case.

She had phoned me before she had called the "assistance" and I quizzed her on the same sort of thing. She mentioned that she could not lock the car when she parked it - she was in a hurry - and also said it beeped 3 times. I did not get the significance of this until she got home and I was able to read the handbook.

We have been having unexplained "consumption problems" at times after she has driven the car but so far I have been unable to find the reason - NOW I KNOW

I asked her if she switched the engine off when she got out - blank look I had told her how to start the car by pushing the POWER switch but had failed to tell he to use the same switch to stop the bloody thing. Too much technology for a simple country girl - and I now find she was taking no notice of the 3 beeps. I doubt that she never switched the power off but that occasionally she forgot to do so. So it looks that it is just possible to leave you car ON by accident if you disregard the warnings. At least it should never happen again.

One question. - How long does it take to get the auxilliary battery back to a working voltage after it has gone flat

PS: Hope the car starts tomorrow morning

Mike
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#8 (permalink) Old 03-13-2008, 08:17 AM
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Default Re: battery died

If the 12v battery was completely depleted, it has probably been damaged and should be replaced. A good indication of that is it will not hold a charge for very long.
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#9 (permalink) Old 03-13-2008, 09:54 AM
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Default Re: battery died

Because of all the posts and complaints along with the more than normal amount of dead 12 volt batteries, all attributed to the under size battery, Toyota has seen fit to continually put in this car, I believe the first addition to the car before the overnight plug in charge for the main batteries should be either a standard size battery installation or a plug in battery tender option.
Do you suppose Toyota doesn't pay any attention to feedback from their dealerships? They seem to realize the reason for the battery problem. (Athough, any believing the sks can cause it in a car parked less than 6 months is subject to "wonder")
It's amazing they would let this problem continue. A lot like the "loss of the nail." One guys simple problem occurring just a couple of times in this new generation type of locomotion could give the car a troublesome reputation.
Personally, I would have thought that a standard battery would have appeared in the 05 Prius. Bigger using 1/3 of it's capacity is a lot better than "smaller" using 90% of it's capacity. The margin for error seems to have "caught" a lot of new owners.
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#10 (permalink) Old 03-13-2008, 09:00 PM
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Default Re: battery died

Quote:
Originally Posted by tomer
My Prius is about 2 months old, a 2008, with package 7.
I left it at the airport for 6 days when traveling, came back the other day to find the battery dead. I needed to get a jumpstart.

I did not leave any lights, etc on. When I called the dealership, they did not sound surprised, and attributed it to the "onboard computer" which will continuously drain power from the battery.

What gives? Do I really have to expect to start the car every few days so the batter does not keep dying on me? Is this typical?
Do you have LoJack or some other 3rd party "security" system installed? These are notorious for draining batteries.

2007 Camry Hybrid
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