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Photography > British Photography > Re: Pentax DL -...
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Re: Pentax DL - battery voltage mystery

by "Mike Coon" <Mike@[EMAIL PROTECTED] > Apr 5, 2008 at 10:29 PM

Peter wrote:
> ongar_route@[EMAIL PROTECTED]
 wrote
>
>> Have you always used the same set of batteries?
>>
>> NiMH batteries have a limited lifespan, ie. they can only be charged
>> a certain number of times before displaying just the symptoms you are
>> describing.
>
> I do check them with a voltmeter, before/after, and they work fine in
> other applicances.

You won't get a useful reading from a voltmeter unless you put a 
representative load on the battery. As it ages the internal resistance may

increase, reducing the voltage under load.

And of course if the contacts in the camera are not as clean as when it
was 
new there may be loss there too. You already appreciate that rechargeables

may be marginal.

> I've got a whole collection; some old, some brand new.

Are you saying that all batteries give the same result? Suggests camera 
corrosion as the common change...

>> I think the fact you mention it works properly on alkaline batteries
>> tells you all you need to know - your NiMH rechargeables are life-
>> expired.
>
> That would be logical, except that I do check them.
>
> The mystery is this: a NIMH can *never* be higher than about 1.25V,
> which represents a pretty flat alkalike battery. So, how did the NIMH
> ones ever work in the first place? I've done whole 2-week holidays on
> one set of them.

Clean the camera contacts and then see.

Mike.
-- 
If reply address is invalid, remove spurious "@[EMAIL PROTECTED]
" and substitute "plus"
where needed.
 




 8 Posts in Topic:
Pentax DL - battery voltage mystery
Peter <peter0o0o0o@[EM  2008-04-04 06:21:43 
Re: Pentax DL - battery voltage mystery
ongar_route@[EMAIL PROTEC  2008-04-04 11:45:28 
Re: Pentax DL - battery voltage mystery
Peter <peter0o0o0o@[EM  2008-04-05 07:04:51 
Re: Pentax DL - battery voltage mystery
"Mike Coon" <  2008-04-05 22:29:33 
Re: Pentax DL - battery voltage mystery
Rob Morley <nospam@[EM  2008-04-06 11:36:22 
Re: Pentax DL - battery voltage mystery
"Mike Coon" <  2008-04-06 15:10:28 
Re: Pentax DL - battery voltage mystery
"Mike Cawood, HND BI  2008-04-05 15:10:23 
Re: Pentax DL - battery voltage mystery
"Trev" <trev  2008-04-05 15:52:22 

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tan12V112 Wed Dec 3 17:24:38 CST 2008.