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Re: [OM] 12 volt battery advice

Subject: Re: [OM] 12 volt battery advice
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 15 Sep 2009 19:29:46 -0400
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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