Is this considered a bad level for the 12v battery?

@strawbrad is our minnesota 12v expert

 

yep.
what makes you think it might be under warranty?

 

The manufacture date is 4 Sep 2016, so some pro-rated warranty left.

 

I hope he reports back with what the warranty did for him.
This likely will be a good example of how "pro rated" warranties work......or don't.

 

It's 33 degrees outside this morning in the tundra. Perfect weather for checking battery voltage. The battery in my work car measured at 12.22 volts. It was last driven yesterday evening. I have another car that has sat since Wednesday, three days, and it's battery is at 11.88 volts. My wife drove her Prius this morning before I got around to checking voltage. After sitting for about a hour it's battery was at 12.12 volts.

It would be great if more members would go measure the resting voltage of their 12 volt batteries and post the results.

 

In the Coast Range of Oregon, overnight temperature 41, daytime highs around 54 about the beginning of October, I tested my direct from the dealer, purchased in January 2014, TrueStart battery manufactured by YUASA and it was at 12.3V after sitting overnight.

I tested with my Klein digital Multi-tester at the jump point under the front hood.

Decided to keep it around for at least another winter. Don't have a lot of spare cash, I am still restricted a fair amount with movement of arm and bending, plus, I am optimistic it should last at least one, maybe two more years.

 

My wife drove ours yesterday, maybe 10 kms total. Checked this morning (at the under hood jump point, had to open door to pop it), current temp 6/42 C/F: 12.84 volts.

It's an Optima Yellow Top, put in 4 years back as of September.

Full disclosure: I'm a battery hypochondriac; our battery spends pretty much every idle day hooked up to a CTEK 4.3 charger. Our use of the car is sporadic, it'll regularly sit at least one day, sometimes 3 or 4. It had not been on the charger for a few days though, when I took the measurement this morning.

 

my 7 1/2 year old was 12.7, until it wasn't.

otoh, my 15 year old dakota battery was load tested yesterday, and they said it was good. i'll put a meter on it.

 

the 6 month old prius oem battery measured 12.88v this morning, and the 14 year old dakota battery measure 13.07v
the prius dropped to 12.7 when i opened the drivers door

 

Yeah I'm a believer. If you're trying to get consistant conditions for measuring, I found too, that act of opening the door to pop the hood does knock about 1/10 of a volt off.

Your Dakota battery is unreal!

 

i wonder if the 28,000 miles is actually good for the battery?

i do keep a maintainer on it all winter

 

That's the key. Our garage queen 2010 Prius is almost constantly on a charger.