When Will My Motorcycle Battery Die? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 22 (permalink) Old 02-22-2017, 03:45 PM Thread Starter
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When Will My Motorcycle Battery Die?



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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 Ė 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 youíre 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 ďstress testĒ your battery at the same page, along with a lot of other battery tidbits that will let you know for certain if itís time to replace.

Send your moto questions to AskMOAnything@motorcycle.com. If we donít know the answer, we know who does, and if they donít know weíll 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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post #2 of 22 (permalink) Old 02-22-2017, 04:11 PM
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That's easy to answer. When you least expect it.
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post #3 of 22 (permalink) Old 02-22-2017, 05:16 PM
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When you're furthest from home.
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post #4 of 22 (permalink) Old 02-22-2017, 07:07 PM
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I always got MC jumper cables under my seat.
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post #5 of 22 (permalink) Old 02-22-2017, 07:27 PM
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#4. When it is most inconvenient. If you use your motorcycle for a get-away vehicle, a dead battery would be most inconvenient.

#5. All of the above.

A fully charged 12 volt lead-acid battery should read 13.2 volts (2.2 volts/cell X 6 cells). At 12.7 volts, my battery would have been replaced.
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post #6 of 22 (permalink) Old 02-22-2017, 11:55 PM
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The YUASA website says 12.6V is 100%, 12.8V 100% charged with sulphate stop,

http://www.yuasabatteries.com/faqs.php?action=1&id=30
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post #7 of 22 (permalink) Old 02-23-2017, 12:03 AM
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My batteries all read 13.1-.2 right after a charge but that reflects a surface charge and they will drop to 12.6-.8 after a start or sitting for awhile. I have a couple of batteries that are nearing their fifth year of service and have always been fully charged when at the 12.6-.8 range.
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post #8 of 22 (permalink) Old 02-23-2017, 03:28 AM
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Went to ride out, moved the bike, stopped it, went back to it ten minutes later and it refused to crank.

So I replaced the original Yuasa on my 2006 Gen2 last year - with a new Yuasa.
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post #9 of 22 (permalink) Old 02-23-2017, 08:01 AM
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I have know my battery in my 07 {original as best I know} was getting old, and the other day after I left my radar detector on overnight, it was very slow to crank so I ordered another one}.

I bought the cheapest battery I could find on Ebay that was AGM.

Some of the cheap batteries you can buy {like the ones in Wallymart} come with a bag of Acid and you install the acid and seal the battery yourself, I avoid those.

I could have bought a Yuasa or other brand name battery for 100 dollars or more, but I bought a 39 dollar Caltric AGM battery. Which is in line with a good price for a battery this size. There are a couple of other brands in this price range on Ebay, but I chose this one simply because the seller was closer to me and I thought I might get it sooner.

These batteries have 12 amps and weigh about 9 lbs. A GOOD 26 amp AGM battery weighs 20-21 lbs and can be had for around 100 dollars, why would a battery 40 percent as big, 40 percent as heavy, and 40 percent of the amps, cost MORE. Somebody's conning somebody.

BUT, for those of you with deep pockets whose only concern is peace of mind, GOD bless you.

07 FJR 38,000 miles 03 Yamaha FJR1300
1986 Yamaha FZX700 1977 Kawasaki KX250 1978? Yamaha TY250 1979 Yamaha YZ250 1970 850 Moto Guzzi 1974? Honda XL 100 1978? Yamaha XT500 1975 Yamaha RD350B 1964 Bridgestone 90S

Last edited by philharmonic; 02-23-2017 at 08:08 AM.
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post #10 of 22 (permalink) Old 02-23-2017, 12:10 PM
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I've been waiting for several years for my OE '07 battery to crap out but so far it's not cooperating. I posted elsewhere about the Antigravity XP-3 power thingee I keep under the rear seat for when I'm far away, facing all uphill in every direction, and it finally croaks.
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