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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 suppose the logical answer is when it is most inconvenient..

Modern chargers with reconditioning cycles can keep a battery going until they fail because the components are consumed. They will be degrading along the way though. I have an optima red top battery I have been using in track cars for over 20 years. Most of that time, I did not really have the correct charger for it.

My Braun electric tooth brush has been charging the battery twice a day for 27 years. The plastic outside of the case is wearing away but the motor and battery and switch work the same as they always did. Gone through probably a hundred heads. Sorry, but on toothbrushes, I'm sticking with German.
 
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