Started my Prius after 17 day vacation, error P080A

This is hard to do .......at an airport !!

 

The 11.7 is not necessarily good.
Anything below about 12.3 or so indicates that the battery is highly suspect.

And the 14.3 is the output of the charging system and has little or nothing to do with the battery itself.

 

Not where I long-term park at PHL, and assume it's available elsewhere.

 

BAD assumption.
That certainly is the exception and not the rule.

Maybe if you ASK and pay extra..............

 

Yes I try to do this whenever we are out for a week. I also turn off SKS system. Also last week we went to the airport, and HV batt was lower than I wanted, so I took a few minutes to force charge to 2 or 3 blue bars before we parked.

 

Not necessarily, though you could always try resetting the code by disconnecting the 12V battery for while and re-connecting it. However the error will probably return next time the battery is stressed.

What I meant about SOC recalibrating is that sometimes the battery has less charge remaining than what the Prius has predicted, particularly with an old worn battery. When this happens then it can drop several bars of SOC (state of charge) almost all at once. My 2005 Prius with over 300,000 km does it quite often. Add the fact that an old battery just sitting there will loose some charge due to self discharge (and the weakest cells are often the worst effected) and it could be in for quite an abrupt drop in SOC once you begin driving.

The problem is that you could be starting out with the battery in a lot lower SOC than the Prius knows about, and if it draws a lot of battery current (which it always does when you drive while the engine is stone cold) then it can reverse bias the weakest cells with a large amount of current, and that's what damages it.

 

There's no need to force charge.....There's something wrong with your car

 

I agree with this assessment. A better "inactive" strategy would have been to put the 12 volt on a trickle charger. I wouldn't be surprised if the traction battery discharged to its own ill fate over the 17 days, uncovering a latent issue.

 

Exactly WHICH wire harness would that be ?
And I hope you understand that a weak 12 V aux battery can cause the computers to FALSELY report that other things are bad when they really aren't.

 

Yes it will. You have a 2005, you are on borrowed time.

GOOD LUCK!

 

Charge & Balance the hybrid battery cells within the pack after long-term storage and before driving the vehicle. This will restore the cell charge level to as good or bbetter then they were when the car was parked for storage:
Prolong® Battery Systems FAQ – Hybrid Automotive

We have hundreds of snow-bird Prius drivers who use our products for the exact purpose.

 

Sorry to hear that. It may be time for a new battery, but personally, I would try a grid charger first. It stands a very good chance of giving your battery many more useful miles.

 

You battery is following the degradation and eventual failure pattern described here exactly:
Prolong® Battery Systems FAQ – Hybrid Automotive

Since the car sat unused immediately prior to the dash light coming on, there is a good chance reconditioning the pack will bring it back to a usable condition.

 

Do you sell your product in EU and at what price? MB31 is from Netherlnads.

 

And the price?

It was reported that Toyota does refurbish old battery packs (in US at least), but they don't do it at the dealers and they may not know that or they are not available in EU. Price will tell what they have.