Tim Munro wrote:
> I recently bought 4 x AA NiMh rechargeable batteries that were on special.
> I charged them up and chucked them in my 550EX and 420EX flash guns and
> noted a 40 - 50% improvement in recycle time - good stuff. I casually
> mentioned the batteries in an email to a Canon tech and was surprised to
> hear back that they are not recommended for Canon flashes. These are 1200
> mAh 1.2 volt batteries and I think the voltage is the issue. But the main
> problem stated was recycle time!, which I know to be improved. I've kept
> using them but wondered if someone with a better understanding of
> electronics could clarify this further for me.
> Thanks, Tim
> www.timmunro.com.au
>
Tim,
According to the 550EX manual, "Speedlite 550EX requires one of the following
types of batteries:
(1) Size AA alkaline LR6 x4
(2) Size AA Nicad KR15/51 batteries x4"
Alkaline cells are 1.5 VDC and Nicad cells are 1.2VDC.
NiMH cells are also 1.2VDC. Their makeup is somewhat different than Nicads.
The differences allow higher capacities than Nicad. A high capacity Nicad
might be around 1000mAH. NiMH cells are now up to 1600mAH in an AA size cell.
They are also somewhat lighter in weight.
Unless specifically stated by a product's manufacturer, they are
interchangeable as long as the entire battery of cells is changed. (A battery
is made up of a number of cells. Do not mix Nicads and NiMH in a battery, and
do not mix NiMH cells of different capacities.) I have been using NiMH in my
550EX since I got it in May, 2001, and in my 540EZ for the past five or six
years. No problems with either flash.
Bob
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-73 de Bob [EMAIL PROTECTED]
Everybody has a photographic memory. Some just don't have any film.
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