Immediate 12V replacement?

That's a good battery. Hooray!

moto g(7) power ?

 

Maybe not.
IF.....he did something like turning the headlights on for a minute and it STAYED at or near 12.53 for the next several hours with the load back down near to zero......that does NOT indicate a good battery.
Serviceable for a few weeks or months, probably, but a drop of .3 V that doesn't recover is NOT a sign of a totally healthy battery.

 

At least you managed another year on the old battery. I would change it very soon. Eight year old agm batteries can fail you even with two hours of driving after parking for ten minutes at a grocery store parking lot. Then you are faced with buying something on the spur of the moment.

 

Winter has little bearing on the 12 V battery in a hybrid because it does not actually "start" the gas engine.

And the voltage reading while running has NO bearing on the 12 V battery at all.
That just tells you that the 12 V charging system is working. The battery itself could be totally shot.

 

You are right. If your 12v battery is failing, it will often draw excessive current. To get high current into the battery, the charging system raises the voltage. If the charging system is continuously supplying high current to the battery, mpg will suffer. A good battery in a low parasitic load environment will charge quickly and the charging system will lower its charge voltage.

 

While that can happen, it is rare.
More often, the failed battery will accept little to no charging CURRENT even though sufficient voltage is applied.
No charge actually going into the battery and no strain on the charging circuits.

 

What exactly makes you think that ?
It depends on how and WHY the battery has failed.......and your use of the word "often" makes your statement NOT true.

 

Experience and I stayed in a Holiday Inn last night.

 

My experience says:
About the only reason a lead acid battery will draw excessive charging current is if the plates in one of more cells are shorted.
The most common cause of THAT is sulfation.

Since AGM batteries are WAY less prone to sulfation and should never "run dry" in normal use......
I don't remember the last time I saw a battery fail like that.

I have seen a really LOT of them refuse to take a charge though, meaning very low or no charging current flowing.
Or what appears to be normal charging current that apparently isn't really DOING much of anything because little to nothing will come back OUT after the "charge".

I prefer Marriott actually.

 

I was wondering where you got the pdf review? Did you write it? I ask because I have 5 battery monitors deployed in Kenya to monitor solar systems at a remote high school. I've written a node-red script that allows me to monitor all of them continuously and chart the historical data for each monitor. I would like to interact with the author of the PDF review that you attached, but there is no contact information.

 

No, I did not write the review from 8 years ago but the product was from a respected company, returns were easy and the pricing was good. It appears to be discontinued now.

The review was on its Amazon product page but Amazon does not allow contact with the reviewers.

Today I would probably get one from Ancel or Antigravity that is bluetooth only but has an up to date monitoring app, very low parasitic draw and supports multiple battery chemistries and voltages.