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Offline Paul2bikes

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Yuasa Battery Technical manual
« on: 05 November, 2018, 02:01:22 PM »
Can this go into stickies for reference if not in already. Page 21 shows the basic methods of checking battery condition with voltmeter readings.

https://www.yuasabatteries.com/wp-content/uploads/2017/07/TechManual.x78244.pdf
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Offline Paullie

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Re: Yuasa Battery Technical manual
« Reply #1 on: 05 November, 2018, 02:33:12 PM »
 :460: very useful ..  :028:

Online Timbox

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Re: Yuasa Battery Technical manual
« Reply #2 on: 05 November, 2018, 03:39:29 PM »
Really good that, top find :028:
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Offline Freddy

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Re: Yuasa Battery Technical manual
« Reply #3 on: 05 November, 2018, 11:44:52 PM »
An 'interesting anomaly' Paul82 and I found when working on his bike's frustrating 'hot-no-start' issue was that volt drop while cranking went to below 8v.  The above document states : If battery voltage drops below
9.5 volts (at 70 F) while the engine is cranking over, the battery needs to be replaced
.

Consequently, more than 1 battery was replaced as the test indicated a bad battery.  As we ultimately concluded, it was the higher compression pressure when hot which was the cause of the low cranking voltage.   When a bigger battery was connected with jumper leads the voltage was higher but the starter motor, even the new one supplied by Triumph, didn't have the guts torque to do the job under extreme conditions.

But all that's history now.     :031:
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Offline Yellow Dog

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Re: Yuasa Battery Technical manual
« Reply #4 on: 06 November, 2018, 12:59:06 AM »
Just shows me how little I understood something seemingly so simple  :033:
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Offline ZuluTiger

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Re: Yuasa Battery Technical manual
« Reply #5 on: 06 November, 2018, 11:50:52 AM »
The other point that is made in the manual (which I've tried to stress in related threads) is that a voltage measurement alone counts for nothing. It has to be coupled with a load. All those 'feel-good' voltmeters mounted on the dash are only worth anything if you remember to consider the load pattern while looking at the voltmeter. And, a compromised battery that will not deliver under load conditions can look perfectly healthy using the voltage readings alone. As Yuasa so clearly point out.
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Offline Freddy

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Re: Yuasa Battery Technical manual
« Reply #6 on: 07 November, 2018, 12:12:18 AM »
That's true ZT, but they're good for telling you that ya bike's about to die due to a burnt up stator - that's about all.
The best substitute for brains is ........what?

Offline Paullie

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Re: Yuasa Battery Technical manual
« Reply #7 on: 07 November, 2018, 08:36:08 AM »
Actually ZT, those 'feel good' dash voltmeters as you put it are very useful, because once you know what voltage to expect during a certain load, you can quickly see if anything has changed, and so gain early warning of any failure. That's the whole point ...

Offline Paul2bikes

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Re: Yuasa Battery Technical manual
« Reply #8 on: 07 November, 2018, 10:25:32 AM »
 :0461: Some of the boys have fitted them for just that ^^^ reason, any change in voltage gives an early warning of R/R or Stator probs.
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Online Rhead

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Re: Yuasa Battery Technical manual
« Reply #9 on: 08 November, 2018, 10:52:45 PM »
having gone through a few stators  i always use a voltmeter. Hi beams and heated grips on, I get 14.5v when its good, and it drops about 1 volt per fried phase when they go. I got about 1200 miles from good till dead on at least 2 stators.