Battery voltage level

I'm wondering what the full charge is on the TM standard battery.

[rvcycleguy]

Originally Posted by jbbernache

I'm wondering what the full charge is on the TM standard battery.

Its either one 12v battery or two 6v in series. A full charged battery should measure on a volt meter at 13.2. That's 6 cells x 2.2 per cell.

[tentcamper]

An hour or so off the charger, my battery is 13.2/13.3 but after it sits a day it's about 12.8/12.7, but it will depend on the outside temp. At 15 degrees it at about 12.4/12.5v in a day.

[Padgett]

Nominal voltage of a lead acid cell (and both wet cell and AGM are lead/acid) is 2.0v but is best to keep at or a little above 2.1v to avoid sulphation so you want it at or above 12.6v.

[tentcamper]

This year I changed how I do my battery tender. I added a timer and have it set to come on 2x per day for an hour each time. That thought can to me as I was setting up my mil's house for her to come and stay with us for the winter. It has seem to working good and the voltage when I check it is always 12.7/12.8 or greater.

Any thoughts on using a timer as I do???

[TrailManorMan]

I unplug and let them rest for a week then put plug back on. I have a digital cheap meter that I leave connected. When I see my number down near 12.7 is when i connect. Depends on garage temperature but usually around a week. By the way my garage never freezes as I have a full kitchen with running water so I have a furnace. Garage temp never below 38 degrees, This works for me, I'm sure others have other ideas also. My two group 31 Interstates are 3 years old, my last pair I got seven years life. By then I was ok with the "life"

Timers would do what I do manually but not forget

[tentcamper]

But getting back to the original question, it depends on the temperature of the battery. I use as a rule of thumb 12.7/12.8 after it's been sitting for 24 hours.

But it depends on the temp.

Several years ago I did some reading. Only because my battery on the camper stored outside would not hold the voltage I was expecting in very cold weather. If interested i'm sure there is a chart you can google. Ideal fully charged voltage most mentioned for a lead acid battery is at 68 degrees 24 hours after charge. Ideal voltages above or below 68 degrees will be difference. Also the highest available amps was at 68 degrees.

Back when I looked at it 12.2/12.3 was a good voltage at 0-F. What I read back then, indicated that colder temps, in the sub zero range was the best for battery storage, but you need a good charger that would adjust to the temps. But if you did it right and stored the battery in a deep freeze you could get 2-4x the life. But at those temp you have a decrease in available amps.

One of my reading back then, talked about chargers and that most did not compensate for temps, and that was the main cause for early life battery failure in the very cold and hot areas.

[TrailManorMan]

Originally Posted by jbbernache

I'm wondering what the full charge is on the TM standard battery.

We, including me sure have the ability to get off topic, maybe it is the weather

It's not exactly off topic if it is either an education or entertainment?

[TrailManorMan]

Originally Posted by moaboy

It's not exactly off topic if it is either an education or entertainment?

Agree but sometimes we drift endlessly ...........