Is this normal battery behavior?

[Guest]

I just received an AGM battery. It came charged and I metered it before putting it in the bike. It read 12.88.

I went for a 15 mile ride and checked it soon after getting home and it read 12.85

My stator is about 1yr old and about 3 months ago I removed my shunt RR and replaced it with
2012 POLARIS RZRS800 RZR S 800 RZRS OEM VOLTAGE REGULATOR RECTIFIER 4012941

I picked it up used on ebay from powersports. I dont know why I am obsessing over the charging system since the bike has never failed to start but ... I am funny that way.
alex

[Skinner]

Looks normal to me. Mine shows 12.8 to 12.9 before a ride. After a ride it will sometimes show as high as 13.1, especially if there have been a lot of highway miles. It then settles back to 12.8-12.9 after a couple of hours.

[Boriqua]

Looks normal to me. Mine shows 12.8 to 12.9 before a ride. After a ride it will sometimes show as high as 13.1, especially if there have been a lot of highway miles. It then settles back to 12.8-12.9 after a couple of hours.

Thanks brother. that put my mind at ease. I took the bike back out after my morning ride. This time I went a bit farther and since its only 99 degrees out I thought I would take a SPIRITED ride through the mountain. Man the bike comes alive after 6000 rpm but back to teh point

when I got home it was at 12.93 so I guess my charging system is fine. now with a new battery in place .. one less thing to worry about letting me down.

[posplayr]

What you are looking for is unobservable with your single measurement. You have to put the battery under a load to test it. The easiest way to do that is the Quick Test. Turn on the key and see how low it drops.

[cowboyup3371]

So what exactly is the problem? Looks normal to me from the ones I have

[londonboards]

Just be done with guessing and fit one of these.

[LAB3]

For what it's worth, I've lived off grid with a lead-acid battery bank. It often takes an hour or more for the "resting" voltage to settle in after a charge cycle has ended.

[Nessism]

What is the charging voltage at 5000 rpm? That will test the function of the bike's charging system. As far as the battery is concerned, no-load voltage testing (as already mentioned) can lead one to false conclusions. Best to ignore that all together.

[Steve]

About the only time a no-load reading has any significance is after the battery has been off the charger for a week or so. That will tell you if there are any internal problems with the battery or if there are any parasitic draws from the bike.

For the record, a fully-charged wet-cell lead acid battery will read 12.6 volts. A fully-charged sealed AGM battery will read 12.8.

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