Re: Energizer Low Self Discharge NiMH
- From: Nick P <nicolas.palladino@xxxxxxxxx>
- Date: Wed, 26 Mar 2008 07:53:10 -0700 (PDT)
On Feb 10, 7:45 pm, Ron Hunter <rphun...@xxxxxxxxxxx> wrote:
Ray Paseur wrote:
I have become a big fan of low self discharge NiMH batteries (aka
"precharged", "hybrid") But I had not seen any mention of these from
Energizer <snip>
A google search turned up nothing you can buy from Energizer.
http://www.google.com/search?hl=en&q=Energizer+Hybrid+Batteries
I've been using theEneloopbatteries for about a year. One application
is the flashlight that we use for an evening walk. We take the dog out
for about 30 minutes a night. There are four AA batteries in the
flashlight. Eneloopbatteries with 2000mAH outlast our non-hybrid
rechargables (all brands) which boast 2500mAH. A full charge seems to
power the light for about a week to ten days. It appears to me that
unless you are going to discharge the non-hybrid batteries very soon
after charging, you are unlikely to benefit from the extra 500mAH. The
extra juice just gets lost in the self-discharge process.
If you do the math, rechargables of any sort make all the sense in the
world. Their initial cost is repaid many times over in lower operating
costs and less garbage in the landfill. I would encourage any
photographer who uses AA batteries to go immediately to rechargables.
Keep a backup set of lithiums if you're going somewhere that doesn't
have electricity, but for everyday use, go with the rechargables. If
your experience is anything like mine, you'll want the hybrids.
Here are some of the infrequently-used places where theEneloophybrid
(or any other brand hybrid) seem to makes sense. The flashlight in the
car. The P&S camera that my son uses once a week or so. My extra flash
unit that gets used only sproadically. The radio triggers. The smoke
detector. Anything else that might sit on the shelf for a couple of
weeks before use, or might need a low power drain for a long time,
because a week or two is time enough for the non-hybrids to bleed a lot
of their power.
I still own and use a few of the non-hybrids batteries - they were prior
inventory - and as they die I am replacing all of them with Eneloops.
Environmentally and economically yours, ~Ray
I did find an application theEneloopbatteries didn't perform well in.
I have some 'stick n' click' lights. Single white LED, with 3 AAA
cells. I have one that gets used about 2-3 hours a day, and AAA
alkalines last 3 months, or longer in that light. A freshly charged set
of Eneloops lasted less than a month. Will have to find another use for
them.
Yes, economically, they would be better, over the course of a year, or
so, but the batteries are a pain to change, so that counts more for me
than the few cents (less than $.75) that three AAA cells cost, if you
add the nuisance factor in.
I am assuming that the LED expects a higher voltage than the NiMH
battery delivers.
Yes, I think you are right! White LEDs require 3.3 to 3.6V in normal
operation. Bear in mind that the LED is not connected directly to the
batteries but there is regulating circuit in between that causes an
extra voltage drop. 3 Alkalines will give you around 4.5V (1.5 x 3)
and you will probably see a brighter light. With Eneloops they stay at
1.2V or above for most of their discharge curve so YES that is to be
expected.
I designed an LED flashlight for my bike and go the the best results
using 4 NIMH batteries. Your Eneloops are great batteries, I own a AAA
that powers my mp3 player and so far it has been the best battery I've
had for this application with 13 hours of continuous playing time
whereas Sanyo 900 or 800 would hardly go above 8 hours of playing
time.
.
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