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It depends where the bike lives: Hot and cold climates are both harder on batteries than temperate climes, and bikes that get ridden regularly are easier on batteries than ones that sit for months – though a good battery tender with a float feature negates much of that. In fact, I was bragging about the Shorai lithium-iron battery in my bike not long ago, which must be seven years old now and has never seen a charger, when my friend Jim said big deal, the original equipment sealed AGM battery in his VFR lasted 9.5 years, and his 21-year old Ducati is only on its second battery. So, sealed batteries can last a long time especially if you’re OCD about maintenance.

According to several sources including BatteryStuff.com, though, your 12.3-volt reading means your battery may be on its way to Nirvana; a fully charged one should read 12.7 volts or above. Since you like to play with your voltmeter, there are instructions to “stress test” your battery at the same page, along with a lot of other battery tidbits that will let you know for certain if it’s time to replace.

Send your moto questions to [email protected]. If we don’t know the answer, we know who does, and if they don’t know we’ll make up something reasonable-sounding. What do you want for free?
Read more about When Will My Motorcycle Battery Die? at Motorcycle.com.
 

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I ride a C50T , 2011 with 28000 mi....I have had an AGM battery that I bought from Auto Zone 3 1/2 yrs ago....I noticed it wasnt starting my bike and thought it was going bad...I had it tested and it was going bad...I bought the same battery, charged it and It makes a world of difference....I live in central Florida and ride it almost every day all year long. I will replace the new one when it becomes 3 yrs old.
 

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HEAT is hard on batteries.
If it sits out in the Florida heat in the summer time, that 3 1/2 years might be about right.
In cooler weather.....or kept inside.....a good AGM battery should last a bit longer than that.
4 to 6 years is not uncommon......but the one from Auto Zone might not be the best either.
I suspect that they don't sell many batteries that size.
I wonder how old it was when you got it ??
Just sitting around with no charging for years isn't good either.

P.S. Might be a good idea to check the charging voltage too.
 
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