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Re: [OM] 12 volt battery advice

Subject: Re: [OM] 12 volt battery advice
From: "Jim Nichols" <jhnichols@xxxxxxxxxxxxx>
Date: Tue, 15 Sep 2009 18:43:34 -0500
Your charger may be ok.  Take a look at the info in this linked document.

http://www.powerstream.com/SLA.htm

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, September 15, 2009 6:29 PM
Subject: Re: [OM] 12 volt battery advice


> Perhaps that's the reason for the decline of the battery.  On the other
> hand I have treated it poorly and despite my maltreatment it has lasted
> I think about 3-1/2 years.
>
> Chuck Norcutt
>
> Jim Nichols wrote:
>> I'm not sure what the experts say, but, in my experience, one needs about 
>> a
>> 1-volt "headroom" between the charger output under load, and the voltage
>> expected from the fully charged battery.  Anything less just leaves you
>> partially up on the recharge curve, and cannot fully recharge the 
>> battery.
>>
>> Jim Nichols
>> Tullahoma, TN USA
>> ----- Original Message ----- 
>> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
>> To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
>> Sent: Tuesday, September 15, 2009 6:18 PM
>> Subject: Re: [OM] 12 volt battery advice
>>
>>
>>> Possibly.  I measured the output of the maintenance charger and could
>>> only see 12.85 volts which is about what the battery was raised to.  But
>>> it dropped to about 12.5 after firing two Alien Bee B800s only 6 times.
>>> I had expected to see something between 13 and 14 on the maintenance
>>> charger.  The old car charger puts out about 13.5 so I hope to see a bit
>>> more voltage in the morning.  But the charge rate has already dropped to
>>> something very low... something I can't accurately read on the guage.
>>>
>>> Chuck Norcutt
>>>
>>>
>>> Jim Nichols wrote:
>>>> Since a car alternator puts out a little over 14 volts, you have 
>>>> probably
>>>> gone about as high as it will go.  I usually see a recharged battery 
>>>> sag
>>>> a
>>>> little if it sits overnight.  Could your problem be with the 
>>>> maintenance
>>>> charger?
>>>>
>>>> Jim Nichols
>>>> Tullahoma, TN USA
>>>> ----- Original Message ----- 
>>>> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
>>>> To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
>>>> Sent: Tuesday, September 15, 2009 5:02 PM
>>>> Subject: Re: [OM] 12 volt battery advice
>>>>
>>>>
>>>>> I have assumed it's toast and ordered a new one from a local 
>>>>> electronics
>>>>> supplier who promises delivery in 3 days.  That's good because I need 
>>>>> to
>>>>> do some formal outdoor portraits of a friend's daughter in her wedding
>>>>> dress before the wedding day.  In the meantime I have put my old 6 amp
>>>>> car charger on the old battery and it is now charging at about 2 amps
>>>>> vs. the other 1.5 amp maintenance charger.  After a couple of hours it
>>>>> raised the no load voltage to about 13.25 or about 0.4 volts higher 
>>>>> than
>>>>> I had seen before.  I think I will let it charge, then rest for 24 
>>>>> hours
>>>>> and then charge it again as per the advice on the Battery University
>>>>> link.
>>>>>
>>>>> I'm sure I'll send it off to the local toxic waste facility but I'm
>>>>> curious to see if it will be at least somewhat rejuvenated.
>>>>>
>>>>> Chuck Norcutt
>>>>>
>>>>>
>>>>> Ken Norton wrote:
>>>>>>> This battery is about 3 years old but rarely used and rarely 
>>>>>>> charged.
>>>>>>> Do you think it's toast?
>>>>>>>
>>>>>> Without a regular float (maintenance) charge on the battery, I'd say,
>>>>>> yes,
>>>>>> it is probably toast.  SLAs don't take to slow-drain very well.
>>>>>>
>>>>>> AG
>>>>> -- 
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>>>>>
>>>>>
>>>>
>>> -- 
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>>>
>>>
>>
>>
> -- 
> _________________________________________________________________
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> Themed Olympus Photo Exhibition: http://www.tope.nl/
>
> 


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