xyyc@xxxxxxxx writes:
<< Is there any one AA battery that has a longer life than others when used
in light meters and flash guns, and especially the F280?
>>
In low current applications which would generally be something like a light
meter ( but there might be a high current design with LED display for
example) most cells should have a similar capacity. Even non alkaline AA
cells have similar capacity at very low current. (But alkalines have better
shelf life due to mainly to better sealing). The difference between "high
power cells" and normal cells is mainly in the plastic seperator and the
depolarizer chemicals. In rapid discharge high current applications the cell
voltage does not drop as quickly with improved seperator and better
depolarizer. This translates to much better life because the cell stays just
above the electronic circuits cut off point rather than just below. Flashes
are very high current devices but the cyclical nature of the load allows some
recovery between discharges. Flashes that include an active voltage feedback
control loop can extract more energy from the battery than those that don't
because they can run better with worn out batteries.
So branded Alkalines are probably modestly better than generic devices
for flash use but for meter use it probably does not matter unless the meter
has an LED display. Alkalines are better from a leakage and storage point of
view than non alkaline cells, so are worth it from a damage to equipment
point of view.
For flashes with a voltage control feedback loop like the BG2 or
Sunpack 544 it probably makes little difference but the T32/20 will probably
do a little better with branded cells since they are more sensitive to cell
voltage drop off.
Regards,
Tim Hughes
>>Hi100@xxxxxxx<<
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