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Re: [OM] Best rechargeable batts for my Olympus FL-50R

Subject: Re: [OM] Best rechargeable batts for my Olympus FL-50R
From: David Irisarri <div2000@xxxxxxxxxxxxxxxxx>
Date: Fri, 26 Jun 2009 23:18:56 +0200
Hi Ken,

Thanks also for this info. Sanyo eneloop seems to be the best solution 
for my purpose as I am not a pro. I was only worried about the number of 
shots. I don´t think I will take more than 250 shots, so with four 
eneloop batts and another four AA alkaline non rechargable ones should 
be plenty enough.

Regards,

Dave


Ken Norton escribió:
>> 1. They have lower internal resistance, so they can deliver higher
>> currents for faster recharge times.
>>
>>     
>
>
> A few months ago, when I was rebuilding the battery pack in a T45 flash, I
> researched my battery options and spent a lot of time on the technical
> issues involved in battery technology. The T45 battery packs are NiCd, not
> NiMh. I considered converting the pack over to NiMh and modding a charger
> for it.
>
> I stayed with the NiCd batteries for several reasons. For one thing, the
> charger modification was going to be a bear, but secondly, I calculated the
> current draw the T45 has and it was high enough to actually damage the NiMh
> batteries. (The T45 is in the "extreme" draw category--fuses need not
> apply).
>
> Both battery types have low internal resistance, but when applying large
> draw (near short) to the batteries, NiCds will deliver the current without
> internal damage to the cells.  NiMh cells will succomb to internal filiment
> problems and other nasties when "cooked" in this manner. NiCds are more
> likely to suffer "memory effect" but unlike NiMh cells, do not deteriorate
> through charge-discharge cycles.
>
> Another interesting thing I learned about NiCd cells is that they charge
> cold, but once peak recharging has been reached they quickly warm. (This is
> why smart NiCd chargers usually used thermal sensors). NiMh cells charge
> warm.  Learning this is a way I charge the T45 pack.  I start out by time
> (knowing how much I've used it) and then check the pack every 15 minutes or
> so until I feel it going warm.
>
> Just a side-note, I have yet to completely drain the T45 pack.  I have no
> idea just how many flashes I can get out of it as it has far exceeded my
> requirements for any event shoot.
>
> Now, all that said, spend the money for the Sanyo Enerloops for the FL50R.
> Best general-purpose AA rechargeables around.
>
> AG
>   

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