I've had some experience with NiMH and a good battery charger with
my -DS.... although no Eneloops (yet). I've had two different batches of
cheap, no-name batt (Powerizer?), and a couple sets of Energizer. I've
got a LaCross BC-900 charger so I can accurately see how they perform and
charge/discharge them correctly. Bottom line is that the camera (at least
the -DS) is *VERY* dependent on battery voltage. It will crap out and
refuse to operate once the loaded voltage goes too low... where "too low"
is NOT the 1.0Vpc that is typically used to measure cell capacity, and
"loaded" is the relatively large current the electronics draw when the
camera is turned on.
Look at the second plot in the link you sent. If the camera says
any battery less than 1.2V is "dead," then no-name will have 800mAH and
Eneloop 1400mAH. In fact, if the threshold is anything more than 1.1V,
the higher (under load) voltage of the Eneloops will be superior to the
no-name. Most electric devices crap out WAY before the minimum threshold
voltage of a "dead" NiMH cell... the only time you get the rated capacity
is under testing on the bench, or using devices that don't shut off
(flashlights, etc).
Oh, and the continual trickle charge is not necessarily the best
way to keep batteries in good health. It can grow metalized "whiskers"
within the cell and shows up as voltage depression... effectively reduced
capacity.
-Cory
On Tue, 6 Jan 2009, JC OConnell wrote:
never mind, I looked it up myself,
as you can see, even sanyo's own
"regular" nimh batteries have "far superior"
capacity on a full charge than their
own eneloopes:
http://www.eneloop.info/home/performance-details/capacity.html
So what does this mean, well if you use your
batteries within a couple months of charging
the eneloops will run out of energy quicker
than regular nimh batteries.
the only advantage of using eneloops is if
you charge and then dont use for two months
or more. By then the self discharge of the
regular nimh will have equalized to the the lower
capacity of the eneloops have in the first
place when fully charged.
So, unless you actully wait 2 months to use the
eneloops after charging, they are inferior,
not superior to regular nimh for what a battery
does which is store ususable energy.
JC O'Connell
hifis...@gate.net
-----Original Message-----
From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of
JC OConnell
Sent: Tuesday, January 06, 2009 8:45 PM
To: 'Pentax-Discuss Mail List'
Subject: RE: *ist DS storage question
yup, far superior if you value charging but not using your batteries for
months later. BTW, do these eneloops have as much capacity in mAH as
other nimh batteries or not?????
JC O'Connell
hifis...@gate.net
-----Original Message-----
From: pdml-boun...@pdml.net [mailto:pdml-boun...@pdml.net] On Behalf Of
Bruce Walker
Sent: Tuesday, January 06, 2009 6:50 PM
To: Pentax-Discuss Mail List
Subject: Re: *ist DS storage question
Brian Walters wrote:
Re rechargeable batteries. It's been said before here but worth
repeating that Sanyo Eneloops are far superior to most other
rechargeables.
Uh, oh. Fire in the hole!
:-)
-bmw
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*************************************************************************
* Cory Papenfuss, Ph.D. Electrical Engineering, PPSEL-IA *
* Research Associate, Vibrations and Acoustics Laboratory *
* Mechanical Engineering *
* Virginia Polytechnic Institute and State University *
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