[rollei_list] Re: New charger for Rolleiflex 6000 cameras
- From: Don Williams <dwilli10@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 06 Apr 2017 11:44:22 -0500
At 10:28 AM 4/6/2017, you wrote:
I don't really now, I suppose they should be similar in (voltage
and) current. When the cells are wired in series, the cell with the
highest resistance (lowest current) determines the current in mA of
the whole battery pack [?].
Ferdi.
Not precisely but in some way. As the series batteries are
discharged, near the end of their charge, one battery will eventually
provide ~0 (or low) volts and the pack voltage will be less by ~value
of a cell. Conversely, when charging the "weaker" cell will reach
full charge first and might be over-charged, maybe damaged. I really
don't think either issue affects camera batteries which are carefully used.
I have observed an electric-powered model plane, one with ducted fan
propulsion, which flew at 150 mph, land with batteries so hot that
they couldn't be touched by hand and had to be immediately removed
from the plane to cool and to prevent damage to the plane. This was
a demo in San Diego by a pilot on tour from Germany. He didn't seem
to be concerned with battery matching.
One interesting thing is that the trend now in electric airplane
models is the use of "pulse charging" to get full charge. I haven't
found the reason, even though a friend gave me an exotic pulse
charger (>$150 cost) which he had won in a raffle because he already
owned one. I don't fly models and it's still packed after moving
here 10 years ago. I do have some rechargeable camera and shop
equipment but the batteries are all individual removable cells. I
intensely dislike battery powered anything, other than cameras and flashlights.
DAW
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