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Battery not charging past 11.7 volts...

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gimpy limp
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Joined: 19 Mar 2005
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PostPosted: 13:42 - 15 Jul 2006    Post subject: Battery not charging past 11.7 volts... Reply with quote

Does anyone know why a battery would only charge to 11.7 volts? I've had it on for 2 days now. It's frustrating as my last battery done the exact same thing. Both were brand new batteries, the first lasted about 10/11 months and this one is only a month or two old (it's a sealed battery so the level should still be fine as I not long put it in). Would the battery charger be causing this? It has 2 buttons on the charger, one for bikes with a lil picture of a bike and one for cars with a lil picture of a car on it. I bought a seperate (universal)charger just for bikes the other day from the bike shop that i've been using but that makes no difference to the charging. Theirs nothing on the bike that could cause this is their, like a bad earth maybe? so must be the original charger I was using i'm guessing that damaged it?
I'm fed up of buying new batteries now : 0[
Is it worth draining it over night then charging it up again? I need to find out what's causing it really so I don't do any more damage. I recently had the stator rewound if that makes a difference.

I fitted a battery cut off switch yesterday because the wiring is shoddy on that bike (just to see if their was any bad wiring that might be causing it not to charge) and then put it on charge over night which made no difference atall (still won't go past 11.7v):

https://img185.imageshack.us/img185/7074/221to.jpg
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doggone
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Joined: 20 May 2004
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PostPosted: 13:52 - 15 Jul 2006    Post subject: Reply with quote

Why are you charging in it anyway?
The bike should keep it topped up assuming you use it at least once a fortnight.
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doggone
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PostPosted: 13:55 - 15 Jul 2006    Post subject: Reply with quote

Quote:
Is it worth draining it over night then charging it up again
No, that doesn't apply with vehicle batteries - best kept fully charged all the time.
You're more likely to damage it by letting it run down - then the charger boosts it rather too quick - maybe this is what you're doing because the bike isn't charging properly?
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True Blue
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Joined: 10 Feb 2003
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PostPosted: 14:59 - 15 Jul 2006    Post subject: Reply with quote

Sounds to me like the battery charger is at fault. Try anouther one.
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Ichy
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PostPosted: 15:06 - 15 Jul 2006    Post subject: Reply with quote

Can't help with the battery but for what its worth I brought an oximate (?) about 18 months ago and it works with everything I've thrown at it ,sealed, car battery, one that hadn't been used for a year. The only one it can't charge all the way up is one that got fried by a different charger Rolling Eyes
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gimpy limp
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Joined: 19 Mar 2005
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PostPosted: 19:28 - 15 Jul 2006    Post subject: Reply with quote

Is their any way to test the current/amps (is that the same thing?) on a multimeter? I've got a feeling I dont have it on mine (if that was too high on the original charger that would have killed it), I tested both my chargers and these are the readings I got:

older car/bike 'two in one' charger (the one suspect to have killed both batteries):
DCV-20 - 10.1
ACV200 - 24.3

New universal bike battery only (the one I bought the other day from the bike shop):
DCV-20 - 13.10
ACV-200 - 27.6

Does anyone know what ACV is? DCV is obviously the voltage.
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-=[Sam/b]=- cx500's the only way to travel, we do it in style just like jimmy saville
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https://pre-auto.com/cx500/rat_and_survival_gallery_2006
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gimpy limp
Nearly there...



Joined: 19 Mar 2005
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PostPosted: 19:43 - 15 Jul 2006    Post subject: Reply with quote

my cheapo multimeter:

https://img484.imageshack.us/img484/2747/multimetervk2.jpg

I need to find out if it was the old charger that killed them really before I fork out on another battery, i'll have to nab a better multimeter off someone to test for current/amps if mine can't do it.

Those things don't half confuse me Shocked
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finpos
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Joined: 13 Sep 2005
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PostPosted: 10:53 - 16 Jul 2006    Post subject: Reply with quote

DCV = direct current volts
ACV = Alternating current volts (like in your house!)

Using the wrong AC/DC range give you meaningless results

You have two current settings on your meter -

the "DCA" range which you SHOULD NOT USE because the range is too small (you may blow an internal fuse in the meter)

the one that says 10A.
Move the red lead into the top hole (labeled 10ADC).
Put the meter IN SERIES with what you are measuring
i.e. remove the red crocadile clip from the battery +VE, clip it onto the red lead: put the black lead onto the +VE terminal of the battery.

BY the way, if you are measuring the voltage of the battery with a charger connected and that charger is switched OFF, you may get a misleading reading becasue the charger is actually draining the battery!

EDIT just noticed your old charger was charding at about 10V - yes, may well have stuffed the batteries (battery may have been charging the charger!)

finpos.
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Cannon
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Joined: 04 Jun 2006
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PostPosted: 11:11 - 16 Jul 2006    Post subject: Reply with quote

Quote:
EDIT just noticed your old charger was charding at about 10V - yes, may well have stuffed the batteries (battery may have been charging the charger!)

finpos.


Correct to a point. It won't charge the battery but it won't kill it either. I assume the battery was flat before you tried to charge it up, so my question is why? If it was that the bike was not run for a while then it could be something on the bike is draining the battery. If not then it could be the battery is knackered. Buying cheap batteries tends to be false economy so if they were from the local cheap accessory shop you may have a dodgy one mate.

A 12v lead acid battery is made from 6 cells each being 2.1v each hence 12.6v total. This means you need a charger to have an output of at least 13.5v for an effective charge. Most chargers tend to be around the 15v mark, and alternators tend to fluctuate between 13.5-14.8v. All these are DC volts BTW not AC volts. The only time you will measure ACV on your bike is straight from the generator windings before the rectifier.


P.S This should really have been posted in the workshop section mate Wink
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