**UPDATED** Car died after leaving it with the valet...

What you describe is a dead 12v battery.

Holding the power button should be known to everyone, it is in the manual too and the commonly recognized way to power on and off electronics. Try it on your computer, it works too. Press it momentarily and it shuts off gracefully. Hold it down and it completely cuts power.

Your headlights wouldn't work because they were probably HID lights, and couldn't get enough charge to ignite the initial plasma.

Everything is very explainable and worked exactly as expected for a dead 12v.

As to how it happened, you have a 6 year old battery. A brand new 2010 is manufactured in 2009, meaning it is about 6 years old. That's older than average life expectancy. My guess is that the valet did something. Leave a door open, exited through the passenger door (didn't auto shut off headlights) or something like that. A weak battery was killed, and there you go.

No need for a dealer. No need for diagnostic fees. Your 12v battery is dead, replace it. If you want to save a few bucks, then hook it up to a 12v charger for about 8 hours. Since you are in LA, you don't care about freezing temperatures so you can probably eek another year or two or three out of it after recharged.

 

My 12V did the same thing before it went toast after I sat in the car with the car off and the headlights on (I thought they went off automatically...the catch is after the driver's door is opened).

Wouldn't start, gave it half hour or so, then had enough juice to start the car. Analyzed it before getting a Deka battery and sure enough it was on it's way out.

 

Lesson Learned - Never use valet parking...

 

Long story short, you need a new 12 volt battery.

Best of luck to you.

 

By your signature it show that you own a 2010, it is enough wear and tear on the Aux battery. I would replace it for a NEW one.
I will recommend a proper Optima yellow top as a replacement.

 

The valet was able to back the car to you because reverse in a prii is electric, while forward can be electric or ice, so even thou the 12v wouldn't start the ice, the 220v was able to move the car backwards, remember to trickle charge the new yellow optima overnight before hooking it up in your car, the gen3 is easy to access the 12v as long as the rear hatch opens

 

NO, no, no.
12 V never starts ICE in prius. I agree the 12V is bad but only hope the hotel boys didn't reverse polarity while "jumping." it can be an expensive fix.

 

i would personally take the old 12v to an autoparts store that has a prius battery replacement in stock. they can test the old one and confirm if it's dead.

 

Honest to god Lucifer (pun intended), I'm thinking to put you on ignore. Not cus you're nasty, just the steady torrent of shoot-from-the-hip misinformation, lol.

 

Can you type the name of the charger? Maybe cus I have AdBlock on, can't see your link.

A smart charger in the 3~4 amp range is what you need, btw. Also, if that was your original 12 volt, I wouldn't go after the valet parkers, it was likely close to it's time. Still, they probably did something, hastened it's demise.

(I'd prefer not to be using AdBlock, but the site acts up without it.)

 

Sounds like a good one, good reviews. Use it on the 3 amp range, no higher. There's a caution in the Owners Manual, use no higher that 4.2 amps I think it says, if I'm not mistaken.

I use a CTEK 3300, fwiw, had it a while now.

 

The charger you are asking about will work. Do two things.

1. Make sure you set it for AGM mode.
2. Use the 3 Amp Setting

I still think in the end you will need a new 12 volt battery. But investing in a charger is a GOOD idea.

Don't be surprised if it takes 12 hours or more to fully charge your battery.

 

The 2010-II indicated in his profile does not have HIDs. Mine certainly didn't.

As already pointed out, this is wrong. The 12V never cranks the ICE. It boots the car's computers and controllers up to 'Ready' and flips the relay that connects the 200V. The latter handles the heavy work, including cranking the ICE.

 

Tall Rob, if the valet reversed polarity when trying to jump start the car it wouldn't have moved two feet and the insurance company would be haggling over the liability for the four figure claim.

 

They reversed the cables on a jump start? Almost a certainty.

The Prius is a car that difficult to run through car washes, leave with valets, jump start, and on and on.