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Flat Battery, ALWAYs,.....need some advice,help. 

 

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Posted: Tue Dec 04, 2007 11:00 am 
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if you're ditching the optima ill have it ;) i recovered one of mine from 5 volts.... long story left it in a car i didnt touch for months and thought i had killed it... blue top (deep cycle marine) best batteries ive ever used... pricey but good i think... tooke me a week to get it charged up again, very slow low current charge on a variable power supply...

disconnect the battery from the car, charge it overnight, take it off charge (assuming its finished) leave it sitting for a few hours fully disconnected from everything and then check the voltage... should be 12.5. what type of optima is it, yellow, red or blue?

good luck hope you get it sorted!
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Posted: Tue Dec 04, 2007 2:44 pm 
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Hey, yeah im gonna do that tonight, its a Yellow top Deep Cycle Optima battery

 

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Posted: Tue Dec 04, 2007 4:27 pm 
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check what the voltage is with the car running too, as stated earlier it should be 13.8-14 volts... check to see if there is anything draining the battery while the car isnt running, turn everything off, shut the doors and check how much current is being drawn (disconnect one battery lead and put a multi-meter between the battery and the lead, make sure its set to the 10A range and that NOTHING is on in the car) shouldnt be using much at all... otherwise what part of the SE 'burbs are you in? im in burwood...
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Posted: Tue Dec 04, 2007 7:02 pm 
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Paulmac wrote:
Ah so, garsiph
I learn every day, the only Optimas I had used were golf balls, they didn't respond well to Inox either.
Your point about the diodes allowing current to 'drain back' is a good one, I had just raised that possibility on another thread here tonight and forgot to add it for him as well, brain fade..
Cheers
Paul


hehehe its all good :)
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Posted: Tue Dec 04, 2007 7:06 pm 
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Ive allready told him to check the Static Drain.
I think he should stop worrying about buying a new battery and address the root cause of the problem.
Somthing is drawing current.
Deep Cycle batterys dont mind being fully discharged. There designed for that.
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Posted: Tue Dec 04, 2007 8:14 pm 
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to an extent thats true, but if you cycle a deep cycle - flat - charge - flat - charge - it will still kill it faster than normal use in say a car... they just handle it a lot better than a normal battery... and fully discharged is only 10.5 volts...
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Posted: Tue Dec 04, 2007 8:28 pm 
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Noooooo, fully discharged is 0.00 volts. and a blonde bird who left her lights on.
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Posted: Tue Dec 04, 2007 10:53 pm 
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hahaha true true i should have said 'flat' is 10.5v you wont get much out of a battery that flat, or below it haha
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Posted: Tue Dec 04, 2007 11:36 pm 
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Thanks alot guys for the info, im in wheelers hill next door to you, and work at MYOB in your area,
After work tomorrow i'll give it a go see if i can find out what it is, i've got a heap of sound equipment so it is possibly that (and the battery is only a year n a half old),
Cheers
-Ash

 

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Posted: Thu Dec 06, 2007 1:35 pm 
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Hey All, I tested my battery, and these were the results:

Car not Running Neg. Terminal off - 12.8 Volts
Car not Running Nothing on - 12.64Volts

Car Running - 13.8Volts
Car Running - Neg Terminal off - 14Volts

Car running Sound system on - 13.5Volts

Car not running sound system on - 12.20Volts

Cheers
Ash

 

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Posted: Thu Dec 06, 2007 1:46 pm 
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they all look normal to me... might be the battery after all :/

how old is it? would be a shame if it was dead, they cost a bit!

got a spare battery or know anyone with one? id try swapping another battery in and see how you go...
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Posted: Thu Dec 06, 2007 3:07 pm 
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Apparnlty the battery is only a year n a half old (as i havn't had the car long), in saying this it hasn't died on me today or yesterday, but then again im still scared to play music with the engine off as i don't think it will last that long:S

 

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Posted: Thu Dec 06, 2007 8:21 pm 
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You disconnected the battery with the engine running ?

Car Running - Neg Terminal off - 14Volts
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Posted: Thu Dec 06, 2007 9:35 pm 
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yeah when the engine was running, i took off the negative terminal to see how much power the alt was producing, was steady from 13.8 - 14volts

 

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Posted: Thu Dec 06, 2007 10:19 pm 
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Can we say damaged Altinator Diodes.

Thats a really bad thing to do. There is big warnings aboutthat in the Service Manuals.
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