What Moose and AG said. How many shots you get will depend on the power
level at which the flash is operating. If you're shooting TTL at modest
distances I suspect you will get at least 250 and probably quite a few
more... maybe as much as 500. But I would go with two sets of Eneloops,
not one. AA alkaline in a high power flash are pretty useless...
they'll have a very short life. In particular, recycle times will begin
to slow to unacceptable values fairly quickly.
Get two sets of Eneloops since you'll need a backup even if one set has
the required capacity. I've been shooting with Eneloops for the past 3
years or so but it's still possible that *your* set might have one cell
that fails in the first hour of use. Be prepared.
Dr. Flash
David Irisarri wrote:
> 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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