I know when not to argue with a EE. Thanks for the info
Skip
----- Original Message ---------------
Subject: [OM] Re: M18V Control grip with NiCds
From: =?us-ascii?Q?Radovan=20Faltus?= <FaltusR@xxxxxxxxx>
Date: Fri, 16 Jul 2004 17:15:21 +0200 (CEST)
To: olympus@xxxxxxxxxx
>
>I saw even 2500mAh NiMh somewhere,
>that's fantastic, but look at it practically.
>
>15V Nicad packs with 12 110 mAhs has capacity for 40 rolls,
>How long time would you use the Grip with 2500s? The answer is maximally
>2 monthes, because of very high self discharging 1,5%/day.
>
>Why Alkalines were "faster"?: 12*1.5V > 12*1.2V.
>But internal resistance of alkalines is poor (high).
>NiCd is best of all in this parameter, but has lower voltage.
>If you used 15 Nicds with voltage 18Volts the same like 12 alkalines
>you would get the best results. Catalogue mentiones
>"large potential power supply 12-16 Volts", so it's not
>recomended to exceed 16 Volts with "hard" sources.
> I think 1/3AA 110mAh Nicd cells are not so hard to damage
>relay contacts in the Grip and MD1/2 electromotor(s) and
>electromechanical contacts. In fact fps was 5.4 with MD2, roll
>loaded and 15*1/3AA Nicds.
>
>I don't like alkalines, because they do NOT work in cold.
>
>But anyway, this is really NOT important for taking pictures!
>
>Radek
>
>==================================================
>> Also, why use NiCad's these days? The new NiMH 2300's would seem to be
>> better choices, no? I was never able to get decent frame rates with NiCad's
>> on my Control Grip 1; Alkalines were so much more powerful.
>>
>> I like the suggestion to cobble together commercial cells to get increased
>> voltage, but that too looks dangerous to the electronics in both the Control
>> Grip or the MD1/2, which aren't exactly robust after as much as 30 yrs of
>> age.
>>
>> Skip
>
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