texascavers Digest 8 Aug 2012 17:04:30 -0000 Issue 1605
Topics (messages 20489 through 20497):
Re: Rechargeable Batteries
20489 by: Marvin and Lisa
20490 by: Bill Walden
20491 by: Geary Schindel
20493 by: Bill Walden
20494 by: Diana Tomchick
20495 by: Dale Barnard
20496 by: Oztotl
20497 by: Andy
Dead Sea Sinkhole Workshop and Karst Post Doc announcement
20492 by: George Veni
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----------------------------------------------------------------------
--- Begin Message ---
I have heard some good things about Sanyo's Eneloops. They are supposed to
hold their charge for a long time and Sanyo claims they can be recharged
1500 times. I've started using them but haven't had enough experience to
definitely qualify them. Whatever you do, don't waste money on Energizer or
Duracell rechargeables.
Marvin
_____
From: James Jasek [mailto:caver...@hot.rr.com]
Sent: Tuesday, August 07, 2012 7:30 PM
To: TexasCavers
Subject: [Texascavers] Rechargeable Batteries
I am interested in making the change to rechargeable AA and AAA Batteries
for my cave light and for electronic strobe. Anyone got any opinions on how
they compare to the Alkaline Batteries. Do the new rechargeables have the
memory problems of the past? Do they last as long and preform as well, and
what brand is the best.
Thanks,
James Jasek
--- End Message ---
--- Begin Message ---
I have been using the same set of Energizer 2700 mAHh rechargeable
batteries for at least 4 years for multiple caving trips per month in my
Apex headlamps (at least 4 headlamps over the 4 years - the batteries
have outlasted 3 Apex headlamps). I always charge these batteries the
night before a trip because the charge will decay over time. Over the
years the capacity has decreased from enough to last an 8 to 12 hour
cave trip to about 6 hours. My suggestions:
Don't consider buying rechargeable batteries at Wal-Mart - most of
the packages of batteries they sell are not labeled with the
capacity and if the package is labeled it is typically a low rating
(less than 2000 mAh).
The Sanyo batteries recommended by Marvin sound good. These
batteries represent a new generation of nickle metal hydride
batteries that hold their charge much better than my old Energizers.
Don't buy nicad batteries as they have a memory effect.
Carefully check the milliampere hour rating of the batteries. As
mentioned most rechargeable batteries sold by Wal-Mart are not
labelled or the capacity label is covered by the packaging. I will
not purchase rechargeable batteries with a rating of less than 2500
mAh. The most recent batch of AA batteries I purchased are rated at
2900 mAh.
Best to use a slow charger rather than a fast charger. The battery
charger I use is a "smart" charger - that is it senses the charge on
each cell. Once a cell is fully charged, the charger switches to a
trickle charge rate (enough to maintain the battery at full charge).
My charger works off a 120 volt wall outlet or a 12 volt automobile
outlet. Charge batteries day before a cave trip to maximum duration.
I use the nickel metal hydride AA batteries for my photo equipment: 3
floodlights each requiring 6 AA batteries, 4 strobe lights each
requiring 4 AA batteries, and 3 high intensity LED flashlights each
requiring 2 AA batteries (With the reflector removed these flashlights
are great for macro photography!).
Don't waste your money buying alkaline batteries.
Best regards,
Bill Walden
On 8/7/2012 11:11 PM, Marvin and Lisa wrote:
I have heard some good things about Sanyo's Eneloops. They are
supposed to hold their charge for a long time and Sanyo claims they
can be recharged 1500 times. I've started using them but haven't had
enough experience to definitely qualify them. Whatever you do, don't
waste money on Energizer or Duracell rechargeables.
Marvin
------------------------------------------------------------------------
*From:* James Jasek [mailto:caver...@hot.rr.com]
*Sent:* Tuesday, August 07, 2012 7:30 PM
*To:* TexasCavers
*Subject:* [Texascavers] Rechargeable Batteries
I am interested in making the change to rechargeable AA and AAA
Batteries for my cave light and for electronic strobe. Anyone got any
opinions on how they compare to the Alkaline Batteries. Do the new
rechargeables have the memory problems of the past? Do they last as
long and preform as well, and what brand is the best.
Thanks,
James Jasek
--- End Message ---
--- Begin Message ---
Bill,
Have any suggestions on where to buy these on line. Considering the number of
batteries I've run through, time to reinvest in rechargeable.
Geary
From: Bill Walden [mailto:wdwal...@windstream.net]
Sent: Wednesday, August 08, 2012 11:43 AM
To: Marvin and Lisa; texascavers@texascavers.com
Subject: Re: [Texascavers] Rechargeable Batteries
I have been using the same set of Energizer 2700 mAHh rechargeable batteries
for at least 4 years for multiple caving trips per month in my Apex headlamps
(at least 4 headlamps over the 4 years - the batteries have outlasted 3 Apex
headlamps). I always charge these batteries the night before a trip because the
charge will decay over time. Over the years the capacity has decreased from
enough to last an 8 to 12 hour cave trip to about 6 hours. My suggestions:
Don't consider buying rechargeable batteries at Wal-Mart - most of the packages
of batteries they sell are not labeled with the capacity and if the package is
labeled it is typically a low rating (less than 2000 mAh).
The Sanyo batteries recommended by Marvin sound good. These batteries represent
a new generation of nickle metal hydride batteries that hold their charge much
better than my old Energizers.
Don't buy nicad batteries as they have a memory effect.
Carefully check the milliampere hour rating of the batteries. As mentioned most
rechargeable batteries sold by Wal-Mart are not labelled or the capacity label
is covered by the packaging. I will not purchase rechargeable batteries with a
rating of less than 2500 mAh. The most recent batch of AA batteries I purchased
are rated at 2900 mAh.
Best to use a slow charger rather than a fast charger. The battery charger I
use is a "smart" charger - that is it senses the charge on each cell. Once a
cell is fully charged, the charger switches to a trickle charge rate (enough to
maintain the battery at full charge). My charger works off a 120 volt wall
outlet or a 12 volt automobile outlet. Charge batteries day before a cave trip
to maximum duration.
I use the nickel metal hydride AA batteries for my photo equipment: 3
floodlights each requiring 6 AA batteries, 4 strobe lights each requiring 4 AA
batteries, and 3 high intensity LED flashlights each requiring 2 AA batteries
(With the reflector removed these flashlights are great for macro photography!).
Don't waste your money buying alkaline batteries.
Best regards,
Bill Walden
On 8/7/2012 11:11 PM, Marvin and Lisa wrote:
I have heard some good things about Sanyo's Eneloops. They are supposed to hold
their charge for a long time and Sanyo claims they can be recharged 1500 times.
I've started using them but haven't had enough experience to definitely qualify
them. Whatever you do, don't waste money on Energizer or Duracell rechargeables.
Marvin
________________________________
From: James Jasek [mailto:caver...@hot.rr.com]
Sent: Tuesday, August 07, 2012 7:30 PM
To: TexasCavers
Subject: [Texascavers] Rechargeable Batteries
I am interested in making the change to rechargeable AA and AAA Batteries for
my cave light and for electronic strobe. Anyone got any opinions on how they
compare to the Alkaline Batteries. Do the new rechargeables have the memory
problems of the past? Do they last as long and preform as well, and what brand
is the best.
Thanks,
James Jasek
--- End Message ---
--- Begin Message ---
Geary,
A good starting place to purchase NiMH batteries is Amazon.com. They
carry the Sanyo Eneloops that Marvin mentioned but they are only rated
at 2000 mAh. I've had good luck with GP, Kodak, and Energizer all rated
at 2500 mAh or more. The GP and Kodak batteries hold their charge longer
than the Energizers but since I always recharge before a cave trip That
doesn't bother me. A couple GP batteries (out of 12) and an Energizer
(out of six) have gone bad over the years but that won't stop me from
purchasing more.
I purchased a dozen Power2000 2950 mAh batteries for my flood lights.
Even though reviews are poor, they work well in that application. These
are less than a month old so not too much experience with them yet.
BTW the property I told you about that contains Coal Trace Cave and
Barefoot Saltpeter Pit has now paid for itself. The owner has recouped
the purchase price from timber sales from the land. Neither the original
owner nor I thought there was enough mature timber to harvest. We were
wrong!
Best regards,
Bill Walden
On 8/8/2012 8:58 AM, Geary Schindel wrote:
Bill,
Have any suggestions on where to buy these on line. Considering the
number of batteries I've run through, time to reinvest in rechargeable.
Geary
*From:*Bill Walden [mailto:wdwal...@windstream.net]
*Sent:* Wednesday, August 08, 2012 11:43 AM
*To:* Marvin and Lisa; texascavers@texascavers.com
*Subject:* Re: [Texascavers] Rechargeable Batteries
I have been using the same set of Energizer 2700 mAHh rechargeable
batteries for at least 4 years for multiple caving trips per month in
my Apex headlamps (at least 4 headlamps over the 4 years - the
batteries have outlasted 3 Apex headlamps). I always charge these
batteries the night before a trip because the charge will decay over
time. Over the years the capacity has decreased from enough to last an
8 to 12 hour cave trip to about 6 hours. My suggestions:
Don't consider buying rechargeable batteries at Wal-Mart - most of the
packages of batteries they sell are not labeled with the capacity and
if the package is labeled it is typically a low rating (less than 2000
mAh).
The Sanyo batteries recommended by Marvin sound good. These batteries
represent a new generation of nickle metal hydride batteries that hold
their charge much better than my old Energizers.
Don't buy nicad batteries as they have a memory effect.
Carefully check the milliampere hour rating of the batteries. As
mentioned most rechargeable batteries sold by Wal-Mart are not
labelled or the capacity label is covered by the packaging. I will not
purchase rechargeable batteries with a rating of less than 2500 mAh.
The most recent batch of AA batteries I purchased are rated at 2900 mAh.
Best to use a slow charger rather than a fast charger. The battery
charger I use is a "smart" charger - that is it senses the charge on
each cell. Once a cell is fully charged, the charger switches to a
trickle charge rate (enough to maintain the battery at full charge).
My charger works off a 120 volt wall outlet or a 12 volt automobile
outlet. Charge batteries day before a cave trip to maximum duration.
I use the nickel metal hydride AA batteries for my photo equipment: 3
floodlights each requiring 6 AA batteries, 4 strobe lights each
requiring 4 AA batteries, and 3 high intensity LED flashlights each
requiring 2 AA batteries (With the reflector removed these flashlights
are great for macro photography!).
Don't waste your money buying alkaline batteries.
Best regards,
Bill Walden
On 8/7/2012 11:11 PM, Marvin and Lisa wrote:
I have heard some good things about Sanyo's Eneloops. They are
supposed to hold their charge for a long time and Sanyo claims
they can be recharged 1500 times. I've started using them but
haven't had enough experience to definitely qualify them. Whatever
you do, don't waste money on Energizer or Duracell rechargeables.
Marvin
------------------------------------------------------------------------
*From:*James Jasek [mailto:caver...@hot.rr.com]
*Sent:* Tuesday, August 07, 2012 7:30 PM
*To:* TexasCavers
*Subject:* [Texascavers] Rechargeable Batteries
I am interested in making the change to rechargeable AA and AAA
Batteries for my cave light and for electronic strobe. Anyone got
any opinions on how they compare to the Alkaline Batteries. Do the
new rechargeables have the memory problems of the past? Do they
last as long and preform as well, and what brand is the best.
Thanks,
James Jasek
--- End Message ---
--- Begin Message ---
Try
http://www.zbattery.com
I purchased four rechargeable C-cell batteries and a multi-battery charger
(will charge everything from AAA to D cells and even 9-volts) from them in
2008, plus various AA and AAA batteries. I use the rechargeable C-cells in my
belt pack Petzl Duo and I love 'em. ZBattery has a darn good selection and
prices.
My favorite AA batteries are the 2700 mAh PowerEx batteries. But if you really
have a lot of time on your hands to do research, visit the Candle Power Forums
where you'll find an amazing amount of information about lights, batteries and
all things related.
http://www.candlepowerforums.com
Diana
* * * * * * * * * * * * * * * * * * * * * * * * * * * *
Diana R. Tomchick
Professor
University of Texas Southwestern Medical Center
Department of Biophysics
5323 Harry Hines Blvd.
Rm. ND10.214B
Dallas, TX 75390-8816, U.S.A.
Email: diana.tomch...@utsouthwestern.edu
214-645-6383 (phone)
214-645-6353 (fax)
On Aug 8, 2012, at 7:58 AM, Geary Schindel wrote:
> Bill,
>
> Have any suggestions on where to buy these on line. Considering the number
> of batteries I’ve run through, time to reinvest in rechargeable.
>
> Geary
>
> From: Bill Walden [mailto:wdwal...@windstream.net]
> Sent: Wednesday, August 08, 2012 11:43 AM
> To: Marvin and Lisa; texascavers@texascavers.com
> Subject: Re: [Texascavers] Rechargeable Batteries
>
> I have been using the same set of Energizer 2700 mAHh rechargeable batteries
> for at least 4 years for multiple caving trips per month in my Apex headlamps
> (at least 4 headlamps over the 4 years - the batteries have outlasted 3 Apex
> headlamps). I always charge these batteries the night before a trip because
> the charge will decay over time. Over the years the capacity has decreased
> from enough to last an 8 to 12 hour cave trip to about 6 hours. My
> suggestions:
>
> Don't consider buying rechargeable batteries at Wal-Mart - most of the
> packages of batteries they sell are not labeled with the capacity and if the
> package is labeled it is typically a low rating (less than 2000 mAh).
>
> The Sanyo batteries recommended by Marvin sound good. These batteries
> represent a new generation of nickle metal hydride batteries that hold their
> charge much better than my old Energizers.
>
> Don't buy nicad batteries as they have a memory effect.
>
> Carefully check the milliampere hour rating of the batteries. As mentioned
> most rechargeable batteries sold by Wal-Mart are not labelled or the capacity
> label is covered by the packaging. I will not purchase rechargeable batteries
> with a rating of less than 2500 mAh. The most recent batch of AA batteries I
> purchased are rated at 2900 mAh.
>
> Best to use a slow charger rather than a fast charger. The battery charger I
> use is a "smart" charger - that is it senses the charge on each cell. Once a
> cell is fully charged, the charger switches to a trickle charge rate (enough
> to maintain the battery at full charge). My charger works off a 120 volt wall
> outlet or a 12 volt automobile outlet. Charge batteries day before a cave
> trip to maximum duration.
>
> I use the nickel metal hydride AA batteries for my photo equipment: 3
> floodlights each requiring 6 AA batteries, 4 strobe lights each requiring 4
> AA batteries, and 3 high intensity LED flashlights each requiring 2 AA
> batteries (With the reflector removed these flashlights are great for macro
> photography!).
>
> Don't waste your money buying alkaline batteries.
>
> Best regards,
> Bill Walden
>
>
> On 8/7/2012 11:11 PM, Marvin and Lisa wrote:
> I have heard some good things about Sanyo's Eneloops. They are supposed to
> hold their charge for a long time and Sanyo claims they can be recharged 1500
> times. I've started using them but haven't had enough experience to
> definitely qualify them. Whatever you do, don't waste money on Energizer or
> Duracell rechargeables.
>
> Marvin
>
> From: James Jasek [mailto:caver...@hot.rr.com]
> Sent: Tuesday, August 07, 2012 7:30 PM
> To: TexasCavers
> Subject: [Texascavers] Rechargeable Batteries
>
> I am interested in making the change to rechargeable AA and AAA Batteries for
> my cave light and for electronic strobe. Anyone got any opinions on how they
> compare to the Alkaline Batteries. Do the new rechargeables have the memory
> problems of the past? Do they last as long and preform as well, and what
> brand is the best.
>
> Thanks,
>
> James Jasek
>
________________________________
UT Southwestern Medical Center
The future of medicine, today.
--- End Message ---
--- Begin Message ---
I second the suggestion to use Sanyo Eneloops. I haven't used them
heavily, but my impression is that they sacrifice some capacity but
reportedly have less loss when in storage and should last through more
charge/discharge cycles. I had bad luck with the Energizers and
Duracell rechargeables, so I gave them all away. They always seemed to
be depleted when I went to use them.
Dale
--- End Message ---
--- Begin Message ---
Three times I've found an exploded (leaking, expanded) rechargeable in my
charger during a normal cycle. Ruined battery, ruined charger.
No battery expert here, but my experimentation is over.
If I'm gonna recycle batteries (which I do), I choose ones I won't ruin and
that are much more dependable out of the bulk pack. Duracells. Also have been
quite pleased with my rechargeable sten batteries too...
Sent cellularly.
-Don
On Aug 8, 2012, at 10:44 AM, Dale Barnard <d...@dalebarnard.com> wrote:
> I second the suggestion to use Sanyo Eneloops. I haven't used them
> heavily, but my impression is that they sacrifice some capacity but
> reportedly have less loss when in storage and should last through more
> charge/discharge cycles. I had bad luck with the Energizers and
> Duracell rechargeables, so I gave them all away. They always seemed to
> be depleted when I went to use them.
>
> Dale
>
> ---------------------------------------------------------------------
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> To unsubscribe, e-mail:texascavers-unsubscr...@texascavers.com
> For additional commands, e-mail: texascavers-h...@texascavers.com
Sent cellularly.
-Don
--- End Message ---
--- Begin Message ---
I just ordered some that I am going to test out. I went with Ansmann brand
NimH 2850mah AA rechargables and some 1100maH AAA. Amazon has good
prices. Ideally, I would like the low discharge batteries (Ansmann max
E+), but I thought I'd try these out first for every day stuff and maybe
get the low discharge ones for caving applications in the future.
Andy
On Tue, Aug 7, 2012 at 7:29 PM, James Jasek <caver...@hot.rr.com> wrote:
> I am interested in making the change to rechargeable AA and AAA Batteries
> for my cave light and for electronic strobe. Anyone got any opinions on how
> they compare to the Alkaline Batteries. Do the new rechargeables have the
> memory problems of the past? Do they last as long and preform as well, and
> what brand is the best.
>
> Thanks,
>
> James Jasek
>
--- End Message ---
--- Begin Message ---
Dear Friends,
The European Association of Geoscientists and Engineers will be hosting a
Workshop on Dead Sea Sinkholes in Amman Jordan, from 23-25 September 2012.
Six interesting sessions are planned including hydrogeology, geochemistry,
geophysics, and engineering. For more information, see
http://eage.org/events/index.php?eventid=733
<http://eage.org/events/index.php?eventid=733&Opendivs=s3> &Opendivs=s3#.
Many of you who are interested in this workshop may also be interested in,
or know someone interested in a post doc position in Puerto Rico. The
announcement is below.
Please distribute this message to anyone you think may like to see it, and
contact the listed sources for more information on the workshop and post
doc.
George
--------------------------------------
Post Doctoral Position at University of Puerto Rico, Mayagüez
The Environmental and Water Resources Engineering Area in the Department of
Civil Engineering and Surveying, at the University of Puerto Rico, Mayagüez
is seeking applications for a postdoctoral position to work in the
development of fate and transport models in karst groundwater systems. The
successful candidate will investigate the effect of extreme hydrologic
events on fate and transport of contaminant mixtures in these systems, and
will undertake collaborative research within a multidisciplinary team to
assess and minimize potential exposure to superfund contaminants. The
research will involve integration of data collection and analysis at the
field level. Groundwater, water quality, statistical, and geospatial
analysis will be important components of this work.
The postdoctoral position is supported by a NIEHS grant (PRoTECT,
http://www.northeastern.edu/protect/), and offers an excellent environment
for working with a highly skilled multidisciplinary team focused on
establishing potential relationships between environmental contaminants and
adverse reproductive outcomes. The team includes faculty and research
associates from a range of science, engineering, and biomedical disciplines,
and academic institutions. The postdoctoral position will also provide
opportunities for the candidate to develop other research activities.
A Ph.D. in civil/environmental engineering, chemical engineering, water
resources, hydrology, geosciences, environmental science, or related fields
is required at the time of appointment. Required qualifications include
strong oral and written communication skills in English. Knowledge and
experience in groundwater systems, contaminant hydrology and remediation,
fieldwork, and GIS modeling are highly desirable. The successful candidate
will: plan, coordinate, and conduct field research work; collect and analyze
field samples and historical contamination data; establish correlative
processes at different scales; collaborate in the integration of
multidisciplinary work among researchers and institutions; prepare
manuscripts for publications; and present research work at meetings.
The initial appointment will be for 1 year with the possibility of extension
based on satisfactory performance, and will commence as soon as possible.
Evaluation of applications and interviews of applicants will begin
immediately and continued until the position is filled. The annual salary
rate for this position is $40,000/yr + a substantial benefit package
(medical, retirement, etc.). Applicants should send a cover letter, a
full CV, a statement of research interest, transcripts, and the names of
three references to Dr. Ingrid Padilla, Department of Civil Engineering and
Surveying, University of Puerto Rico, Mayagüez, PO Box 9000, Mayagüez PR
00681; Email: ingrid.padi...@upr.edu.
More information can be found at:
http://civil.uprm.edu/news_showmore.php?id=20.
The University of Puerto Rico is an affirmative action, equal opportunity
employer.
***************************
George Veni, Ph.D.
Executive Director
National Cave and Karst Research Institute
400-1 Cascades Avenue
Carlsbad, New Mexico 88220-6215 USA
Office: 575-887-5517
Mobile: 210-863-5919
Fax: 575-887-5523
gv...@nckri.org
www.nckri.org
--- End Message ---
