Went to take my car to the dealer for the AKB1 recall this morning, open the door and no lights come on! popped the hood and measured the voltage, 2.0V !!!!! that battery is toast.

no idea why, wasn't seeing any symptoms of a weak battery and she's only been sitting a week.

after reading that article someone posted recently( and a few others) I decided to go with a flooded batter instead of the AGM

corrosion is my only real concern, might prep the battery box a bit if necessary to try and stave that off. Battery sits in a plastic tub, no need to worry about corrosion, got an absorbent mat coming any way

 

I just discovered, I left my phone charger plugged in that 12v socket. Typically, it has this red led light on it when it's charging the phone and it turns off when I turn the car off....but nope, not on the Panamera. Luckily I discovered it and disconnected it from the 12V socket. Not that the small red led would consume much, but still...

 

I haven't seen the battery yet, and must confess I don't know where it is even. Is the original battery flooded type? (I'm sorry, there's so much about this car I don't know yet)....

I tried an appropriately sized one of these in a '12 Prius v. It's been almost one year now and no issues, but it does not work hard in the Prius. They had a little size issue where I had to add a longer bolt and some washers to hold it down, but they are so light comparatively it's amazing...

https://rover.ebay.com/rover/0/0/0?m...2F352321852152

 

Original is AGM, would love a good lithium battery but my wallet (and wife ) say otherwise

Battery is located in the trunk under a panel

 

Ah dead batteries suck! Was it just a battery running out of life, did you check for any other potential causes?

Whats the difference between AGM and flooded?

 

Flooded uses water, AGM is absorbed glass mat. In many ways AGM is sturdier, including number of cycles deep discharge, but I read it is more sensitive to high voltage charging than flooded. The water/acidic solution can leak out of a flooded battery if broken, there is nothing to leak in the AGM. Flooded is more prone to gassing than AGM also, (my inference).

I am a very very poor salesman. I should have shown the Braille Li battery catalog prior to the eBay ones.

Top of the line just under $3k:
https://braillebattery.com/products/i49cs-1

 

Looking like it was just the end of the life for the battery, haven't been able to track down anything that would have caused it to get drained that quickly.

 

For the record, I don’t sell batteries, nor am I here to sell anything.

Toyota, which I’m much more familiar working on my family’s Prius v, also uses AGM, notes if AGM battery voltage is below 11 V, measured with a multimeter at the battery terminals after removing surface charge, should be replaced, so I guess you’re right that yours needed replacing.

Were you able to register the battery okay? Having lugged around an H8 AGM the other day I’m much appreciative that another car is an H6 flooded, much lighter. I’m left reminiscing of the ultra light eBay one comparatively, maybe my back is at least.......

 

Being in AZ and hot tempertures -- here are my observations:

Battery under the hood. AGM style. I buy the Autozone AGM variety 3 yr 100% warranty - almost always get one free within 3 years. My Saab turbo went thru one every 1.5 years since the turbo is right next to the battery. Buy one , get 2 free usually.

Battery under back seat (old Benz), 6 or more years no issue

-- have yet to replace mine in the Panamera but I suspect somewhere between 3 to 6 years since doesn't have the engine heat to content with or turbos

AGM batteries once depleted you can revive but my attempts have not lastest long and I usually just start with a fresh battery.

 

JZchen I didn't bother to register the battery - just chucked it and let it go - at 2v I knew that battery was toast
check the voltage while running - 14.4v, check after driving 12.83v, 24 hours later 12.82, everything point to the battery just failing with no warning signs
the battery sits in a nice plastic "bucket" in the back, as fatpan pointed out its s pretty good spot for battery life

from what I've read, AGM are very picky about the voltage at which they are charged, too high (aka normal for flooded) will reduce the life.

 

Arizona heat sounds brutal. I was talking to a fellow parent at my son's school one day, to someone who had just moved from Arizona, and she noted that they recommended leaving AC on 24 hours, or something like that...

I also read the concern that AGM requires lower voltage than flooded, then just this last week while moving around batteries I needed to look online for instructions on how to use my NOCO Genius G7200. I found something that just made me mad:

12 V NORM charges at 14.5 V
12 V COLD/AGM charges at 14.8 V
12 V AGM + charges at 15.5 V

None of the AGM modes was lower, but in fact actually higher, than flooded....