13.0V Resting

Mex,

Full river batteries? or Forest river who made the RV and provided a flooded battery with a 13.0+ resting voltage.

I was under the impression that Full River AGM were well made, despite their COI

Give 'em time! The manufacturers...

Pretty soon they're gonna pour H2SO4 4.0 Baumé into a group 24 and swear up and down it has 1,000 CCA, 300-amp hours (and in small letters print a 6-month warranty).

4.0 Baumé sulfuric acid is similar to SAE-20W in appearance but is 4-times as heavy as water.

Heat the battery carefully to 50c and check the "resting" voltage. The hissing sound is the dissolved plates precipitating down to the sediment chambers.

But oh man! The "resting" voltage will be in the stratosphere.

This is pure outright chicanery. My opinion of Full River has just fallen a few notches.

Compare it to Lyle Alzado (quote from Wikipedia)

"Lyle Martin Alzado (April 3, 1949 – May 14, 1992) was a professional American football defensive end of the National Football League famous for his intense and intimidating style of play"

All it took was huge batches of ANABOLIC STEROIDS to turn him into an animal. Uh Oh, mustn't cheat! Batteries are like humans. Cheat and you get fabulous factoids and brain cancer. There ain't no shortcuts without penalties!

Why would they do that?????? (It makes my head spin).

NinerBikes wrote:
David is having problems posting on RV net and connecting to RV net. He thinks he may have been banned.

It is true resting voltage, not a surface charge.

I should add, I don't think I've had to add water yet. Or maybe once, but I'm not sure. They are certainly not boiling out water.

Canadian Rainbirds wrote:
With any luck Mexixcowanderer will chime in here.

DAVID! WAKE UP. YOU ARE NEEDED!

David is having problems posting on RV net and connecting to RV net. He thinks he may have been banned.

I have a maint free starting battery (not DC) in my boat that shows 13.0 for at least 2 days, and holds 12.8-9 for a week or more. I never questioned something to be wrong,,,,,just a very good battery.....@ 5 yrs old now.
I have several AGMs that hold 13 for 2 weeks, and 12,8-9 for a month and more.

I would suggest to apply a small load to the batteries for a very short period and measure voltage again. It may be that you have a bit of "surface charge" and it's not an accurate measurement of stored power. FWIW, my 6v's have a SG of a little over 1.29.

With any luck Mexixcowanderer will chime in here.

DAVID! WAKE UP. YOU ARE NEEDED!

The only batteries I have witnessed to hold 13 or more volts resting have been AGM's.

Lifeline gpl-31xt was 13.16v and my northstar-27 is 13.06v.

My flooded batteries in 27 and 31 group sizes have ranged from 12.62 to 12.84.

Hi snowman,

I don't know about the voltage but the higher specific gravity suggests a lower maximum charging voltage--particularly if these are AGM.