Thanks. It never occurred to me that the internal battery resistance
cold be part of the design assumptions.
Chuck Norcutt
Frank van Lindert wrote:
> If the camera or flash is designed in such a way that the internal
> resistance of the battery also limits the current, rather than the
> impedance of the device alone, then a battery with lower internal
> resistance could indeed lead to a larger current flowing through the
> device. IMHO this is to be considered as bad design, but it was often
> used in the past.
>
> I think that this is the reason for the warning (or rather disclaimer,
> I would call it). It is impossible to say if using NiMH cells could
> indeed damage the camera or not.
>
> Frank van Lindert
> Utrecht nL.
>
>
>
> Tue, 02 Dec 2008 07:41:39 -0500, Chuck Norcutt
> <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>
>> A friend just purchased an old Ricoh FF-90 film P&S camera. He wants to
>> use NiMH batteries but the user's manual (which can be found here)
>> <http://www.butkus.org/chinon/ricoh/ricoh_ff-90/ricoh_ff-90.htm> states:
>> ------------------------------------------------------------
>> * Do not use Nickel Cadmium batteries. "Use of rechargeable Ni-cad
>> batteries is not recommended. Due to higher internal amperage, the
>> electronics in your Ricoh camera/flash unit may be damaged. If damage
>> due to use of Ni-cad batteries occurs, the warranty will be considered
>> null and void"
>> ------------------------------------------------------------
>>
>> Can someone explain why this is? I can understand problems with NiCad
>> or NiMH possibly not delivering enough voltage for proper operation but
>> I don't understand just the *capability* of the batteries to deliver a
>> higher current as injurious. In fact, my limited knowledge of
>> electronics (Ohm's law: I=V/R) would say that the fixed resistance of
>> the camera's circuits would cause a lower current draw with lower
>> voltage batteries. Without understanding why I suspect that the flash
>> is the problem since the flash, during recharge, is that only thing that
>> normally draws a high current. If that's the case could NiMH be used if
>> the flash is turned off?
>>
>> Thanks,
>> Chuck Norcutt
>>
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