texascavers Digest 10 Aug 2012 18:07:35 -0000 Issue 1606
Topics (messages 20498 through 20517):
Re: Rechargeable Batteries
20498 by: Bennett Lee
20499 by: George D. Nincehelser
20506 by: Mark Minton
20507 by: Wm Shrewsbury
20508 by: Mark Minton
20509 by: Lyndon Tiu
20515 by: Alex Sproul
NSS awards
20500 by: Jill Orr
Sunday Swim.
20501 by: pstrickland1.austin.rr.com
Kiwi Sink vs Sunday Swim
20502 by: pstrickland1.austin.rr.com
20504 by: Gill Edigar
20505 by: vivbone.att.net
Kiwi Sink
20503 by: Gill Edigar
Batteries
20510 by: James Jasek
20512 by: Diana Tomchick
20513 by: Pete Lindsley
20514 by: Diana Tomchick
Emergency Disinfection of Drinking Water
20511 by: germanyj.aol.com
20516 by: Mark Minton
camera questions
20517 by: Geary Schindel
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----------------------------------------------------------------------
--- Begin Message ---
I obsessively researched batteries a year ago. Long story short, I
recommend:
Battery: Sanyo Eneloops
Charger: Maha C801D
For those interested, here's the long story.
Sanyo Eneloops are the defacto-standard in batteries now. I see them
specifically recommended in different fields and explicitly stated as
the battery used in numerous lighting tests. I use them almost
exclusively. Charger is important, too. Don't skimp on that.
BATTERIES
There are 4 main types of rechargeable:
(1) NiMH (Nickel-Metal Hydride)
Highest capacity, but self-discharges over time. Loses 5-10% within
first 24 hours, and 0.5-1% each day thereafter. I have a bunch of
Energizer Rechargeables. Like Dale said, they're always dead when I go
to use them. You basically have to charge them the night before you go
caving. In camera flash stress test (yes, I know this is for
headlights, but that's the test I was reading in my research and
besides, James does photography, too), these average about 296
full-power flashes.
Examples: Energizer Rechargeable, PowerEx, Sanyo 2700.
(2) LD-NiMH (Low Discharge Nickel-Metal Hydride)
These are a new variation of NiMH that don't self-discharge as rapidly.
They hold 75-80% of their charge after a year. I've switched to these
(Sanyo Eneloops) almost exclusively in both my headlights and camera
equipment because even if I don't remember to or have time to charge
them, they are ready to go. These average 235 flashes, 20% less than
regular NiMH, but I'm happy to trade that for the long-term charge.
Examples: Sanyo Eneloop, PowerEx Imedion.
(3) Lithium
Extremely long shelf life. Wide operating temperatures. Comparatively
light-weight. Unfortunately, they're expensive and don't work well in
camera flashes, so I don't use them. Average 218 flashes.
Examples: Energizer Ultimate Lithium, Energizer Advanced Lithium.
(4) NiCd (Nickel-Cadmium)
Crap. Not even worth talking about.
RECHARGER
Don't overlook the importance of a quality charger. The lesser ones
charge batteries in pairs and stop both as soon as one battery is fully
charged, leaving the other only partially charged. The best charge each
battery individually. They also have an optional "soft-charge", which
helps extend your battery life by charging slower (i.e., 2 hours instead
of the typical 1 hour), and they can recondition the batteries if they
are no longer holding their charge well (doesn't work miracles, but
helps).
The one I highly recommend is the Maha C801D. It can charge 8 AA or
AAA, each on their own circuit, plus has the optional soft-charge and
reconditioning mentioned above. It's a bit expensive (~$65), but I
currently have about 70 AA/AAA rechargeable batteries for my headlights
and photography equipment, so it was worth the investment for me.
I've read horror stories of failed recharging like Don's, but I've never
experienced anything like that. I've recharged hundreds of batteries
totaling well over 1000 recharges on various quality and crappy chargers
and never had a problem. That's not to say that someday it won't happen
to me, too, but so far I am quite pleased with the switch to
rechargeables (well, pleased with the Sanyo Eneloop rechargeables--those
Energizer Rechargeables drove me and apparently Dale crazy with their
rapid self-discharge).
One last note, all these rechargeable batteries degrade over time, so
expect a usable life of about 3-5 years. Furthermore, manufacturing
will affect battery performance and life, so it's best to keep batteries
together in the same set as they were manufactured/purchased. A tip I
picked up from another photographer is that as soon as I buy batteries,
I label them with the year/month of purchase along with a 2 digit
set/battery code, like 3A. That way, I can keep all the batteries of
the same set together, and I know how old the batteries are so I can
move old ones to less critical functions, like TV remotes. Yes, a bit
obsessive, but when I haul my big ass GGG Pep bag loaded with camera
equipment hours back into a cave then run around and setup equipment
everywhere for a shot, the last thing I want is for my flash to fail
because I accidentally mixed up some crappy old batteries with my new
ones. Without my labels, they all look the same. :)
--Bennett
--- End Message ---
--- Begin Message ---
Good advice about keeping the batteries in sets.
That's one of the things I don't like about rechargeables....it's too easy
to be lazy and get them mixed up. If you mix old and new batteries, your
pack's performance declines to that of the old battery. In a worst case
scenario, the newer batteries might try to "charge" the older battery,
causing it to leak, and possibly explode.
This is good advice for any kind of battery. Don't mix old and new. Don't
mix types. Keep and use them together as sets for maximum performance.
George
On Wed, Aug 8, 2012 at 12:57 PM, Bennett Lee <texascav...@bennettandgina.com
> wrote:
> I obsessively researched batteries a year ago. Long story short, I
> recommend:****
>
> ** **
>
> Battery: Sanyo Eneloops****
>
> Charger: Maha C801D****
>
> ** **
>
> ** **
>
> For those interested, here's the long story.****
>
> ** **
>
> Sanyo Eneloops are the defacto-standard in batteries now. I see them
> specifically recommended in different fields and explicitly stated as the
> battery used in numerous lighting tests. I use them almost exclusively.
> Charger is important, too. Don't skimp on that.****
>
> ** **
>
> ** **
>
> BATTERIES****
>
> There are 4 main types of rechargeable:****
>
> ** **
>
> (1) NiMH (Nickel-Metal Hydride)****
>
> Highest capacity, but self-discharges over time. Loses 5-10% within first
> 24 hours, and 0.5-1% each day thereafter. I have a bunch of Energizer
> Rechargeables. Like Dale said, they're always dead when I go to use them.
> You basically have to charge them the night before you go caving. In
> camera flash stress test (yes, I know this is for headlights, but that's
> the test I was reading in my research and besides, James does photography,
> too), these average about 296 full-power flashes.****
>
> Examples: Energizer Rechargeable, PowerEx, Sanyo 2700.****
>
> ** **
>
> (2) LD-NiMH (Low Discharge Nickel-Metal Hydride)****
>
> These are a new variation of NiMH that don't self-discharge as rapidly.
> They hold 75-80% of their charge after a year. I've switched to these
> (Sanyo Eneloops) almost exclusively in both my headlights and camera
> equipment because even if I don't remember to or have time to charge them,
> they are ready to go. These average 235 flashes, 20% less than regular
> NiMH, but I'm happy to trade that for the long-term charge.****
>
> Examples: Sanyo Eneloop, PowerEx Imedion.****
>
> ** **
>
> (3) Lithium****
>
> Extremely long shelf life. Wide operating temperatures. Comparatively
> light-weight. Unfortunately, they're expensive and don't work well in
> camera flashes, so I don't use them. Average 218 flashes.****
>
> Examples: Energizer Ultimate Lithium, Energizer Advanced Lithium.****
>
> ** **
>
> (4) NiCd (Nickel-Cadmium)****
>
> Crap. Not even worth talking about.****
>
> ** **
>
> ** **
>
> RECHARGER****
>
> Don't overlook the importance of a quality charger. The lesser ones
> charge batteries in pairs and stop both as soon as one battery is fully
> charged, leaving the other only partially charged. The best charge each
> battery individually. They also have an optional "soft-charge", which
> helps extend your battery life by charging slower (i.e., 2 hours instead of
> the typical 1 hour), and they can recondition the batteries if they are no
> longer holding their charge well (doesn't work miracles, but helps).****
>
> ** **
>
> The one I highly recommend is the Maha C801D. It can charge 8 AA or AAA,
> each on their own circuit, plus has the optional soft-charge and
> reconditioning mentioned above. It's a bit expensive (~$65), but I
> currently have about 70 AA/AAA rechargeable batteries for my headlights and
> photography equipment, so it was worth the investment for me.****
>
> ** **
>
> I've read horror stories of failed recharging like Don's, but I've never
> experienced anything like that. I've recharged hundreds of batteries
> totaling well over 1000 recharges on various quality and crappy chargers
> and never had a problem. That's not to say that someday it won't happen to
> me, too, but so far I am quite pleased with the switch to rechargeables
> (well, pleased with the Sanyo Eneloop rechargeables--those Energizer
> Rechargeables drove me and apparently Dale crazy with their rapid
> self-discharge).****
>
> ** **
>
> ** **
>
> One last note, all these rechargeable batteries degrade over time, so
> expect a usable life of about 3-5 years. Furthermore, manufacturing will
> affect battery performance and life, so it's best to keep batteries
> together in the same set as they were manufactured/purchased. A tip I
> picked up from another photographer is that as soon as I buy batteries, I
> label them with the year/month of purchase along with a 2 digit set/battery
> code, like 3A. That way, I can keep all the batteries of the same set
> together, and I know how old the batteries are so I can move old ones to
> less critical functions, like TV remotes. Yes, a bit obsessive, but when I
> haul my big ass GGG Pep bag loaded with camera equipment hours back into a
> cave then run around and setup equipment everywhere for a shot, the last
> thing I want is for my flash to fail because I accidentally mixed up some
> crappy old batteries with my new ones. Without my labels, they all look
> the same. :)****
>
> ** **
>
> --Bennett****
>
> ** **
>
--- End Message ---
--- Begin Message ---
The rechargeable lithium-ion batteries used in the Sten and
other lights are also available in an AA size. See
<http://www.orbtronic.com/protected-3400mah-18650-li-ion-battery-panasonic-ncr18650B-orbtronic>,
<http://www.orbtronic.com/batteries-chargers/panasonic-3400mah-18650-li-ion-battery-cell-ncr18650b>.
Note that these are 3.7 volts - twice the usual AA battery
voltage. They are also very expensive.
Mark
At 11:55 AM 8/8/2012, Oztotl wrote:
Also have been quite pleased with my rechargeable sten batteries too...
Please reply to mmin...@caver.net
Permanent email address is mmin...@illinoisalumni.org
--- End Message ---
--- Begin Message ---
I recently ordered these for my Sten from www.batteryjunction.com:
http://www.batteryjunction.com/tenergy-18650-2200-pk.html
All I had to do was put the correct end on the two wires, epoxy the circuit
board to make it waterproof, shrink wrap the batteries (more than they
supplied), charge and go. I used it at Convention for a 5 hour trip there,
as well as another 12 hour trip later - still running fine. Time will tell
how they hold up.
Wm
-----Original Message-----
From: Mark Minton [mailto:mmin...@caver.net]
Sent: Thursday, August 09, 2012 11:17 AM
To: texascavers@texascavers.com
Subject: Re: [Texascavers] Rechargeable Batteries
The rechargeable lithium-ion batteries used in the Sten and
other lights are also available in an AA size. See
<http://www.orbtronic.com/protected-3400mah-18650-li-ion-battery-panasonic-n
cr18650B-orbtronic>,
<http://www.orbtronic.com/batteries-chargers/panasonic-3400mah-18650-li-ion-
battery-cell-ncr18650b>.
Note that these are 3.7 volts - twice the usual AA battery
voltage. They are also very expensive.
Mark
At 11:55 AM 8/8/2012, Oztotl wrote:
>Also have been quite pleased with my rechargeable sten batteries too...
Please reply to mmin...@caver.net
Permanent email address is mmin...@illinoisalumni.org
---------------------------------------------------------------------
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--- End Message ---
--- Begin Message ---
AA battery users should ignore my last post - those
lithium-ion batteries look superficially like AAs, but they are
actually larger.
Mark
At 11:26 AM 8/9/2012, Wm Shrewsbury wrote:
I recently ordered these for my Sten from www.batteryjunction.com:
http://www.batteryjunction.com/tenergy-18650-2200-pk.html
All I had to do was put the correct end on the two wires, epoxy the circuit
board to make it waterproof, shrink wrap the batteries (more than they
supplied), charge and go. I used it at Convention for a 5 hour trip there,
as well as another 12 hour trip later - still running fine. Time will tell
how they hold up.
Wm
-----Original Message-----
From: Mark Minton [mailto:mmin...@caver.net]
Sent: Thursday, August 09, 2012 11:17 AM
To: texascavers@texascavers.com
Subject: Re: [Texascavers] Rechargeable Batteries
The rechargeable lithium-ion batteries used in the Sten and
other lights are also available in an AA size. See
<http://www.orbtronic.com/protected-3400mah-18650-li-ion-battery-panasonic-n
cr18650B-orbtronic>,
<http://www.orbtronic.com/batteries-chargers/panasonic-3400mah-18650-li-ion-
battery-cell-ncr18650b>.
Note that these are 3.7 volts - twice the usual AA battery
voltage. They are also very expensive.
Mark
At 11:55 AM 8/8/2012, Oztotl wrote:
>Also have been quite pleased with my rechargeable sten batteries too...
Please reply to mmin...@caver.net
Permanent email address is mmin...@illinoisalumni.org
--- End Message ---
--- Begin Message ---
... even if it fits, don't put them inside your AA electronics or your
electronics will go kaput as these are 3+ volts, not 1.5 ...
On Thu, Aug 9, 2012 at 10:29 AM, Mark Minton <mmin...@caver.net> wrote:
> AA battery users should ignore my last post - those lithium-ion
> batteries look superficially like AAs, but they are actually larger.
>
> Mark
>
>
> At 11:26 AM 8/9/2012, Wm Shrewsbury wrote:
>>
>> I recently ordered these for my Sten from www.batteryjunction.com:
>>
>> http://www.batteryjunction.com/tenergy-18650-2200-pk.html
>>
>> All I had to do was put the correct end on the two wires, epoxy the
>> circuit
>> board to make it waterproof, shrink wrap the batteries (more than they
>> supplied), charge and go. I used it at Convention for a 5 hour trip
>> there,
>> as well as another 12 hour trip later - still running fine. Time will
>> tell
>> how they hold up.
>>
>> Wm
>>
>> -----Original Message-----
>> From: Mark Minton [mailto:mmin...@caver.net]
>> Sent: Thursday, August 09, 2012 11:17 AM
>> To: texascavers@texascavers.com
>> Subject: Re: [Texascavers] Rechargeable Batteries
>>
>> The rechargeable lithium-ion batteries used in the Sten and
>> other lights are also available in an AA size. See
>>
>> <http://www.orbtronic.com/protected-3400mah-18650-li-ion-battery-panasonic-n
>> cr18650B-orbtronic>,
>>
>> <http://www.orbtronic.com/batteries-chargers/panasonic-3400mah-18650-li-ion-
>> battery-cell-ncr18650b>.
>> Note that these are 3.7 volts - twice the usual AA battery
>> voltage. They are also very expensive.
>>
>> Mark
>>
>> At 11:55 AM 8/8/2012, Oztotl wrote:
>> >Also have been quite pleased with my rechargeable sten batteries too...
>
>
> Please reply to mmin...@caver.net
> Permanent email address is mmin...@illinoisalumni.org
>
> ---------------------------------------------------------------------
> Visit our website: http://texascavers.com
> To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com
> For additional commands, e-mail: texascavers-h...@texascavers.com
>
--
Lyndon Tiu
--- End Message ---
--- Begin Message ---
IMO used to sell AccuPower batteries and chargers that I thought
were excellent. I have a bunch of NiMH AA 2400 mAh that I'm still
using, 7 years later.
They're an Austrian company http://www.accupower.at/index_en.php.
They presently offer AA cells at 2600 and 2900 mAh, and AAA cells
at 1000 and 1200 mAh.
However, their US subsidiary, http://www.accupower-usa.com/, now
offers AccuEvolution AA cells at only 2200 mAh, but that's because
they are the newer "Low Self-Discharge" batteries with greater power
retention, similar to the Sanyo Eneloops. These can be purchased
online for $9.95 for a four-pack, which is very competitive. They're
also available at Real Goods and Overstock.com.
Their AccuManager 20 charger, though pricey ($55), is a full-
maintenance unit that uses pulse-charging and monitoring of each
individual battery (and can charge mixed sizes simultaneously,
keeping them on float indefinitely).
I highly recommend 'em.
Alex
On 8 Aug 2012 at 7:58, 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
--
Alex Sproul
NSS 8086RL/FE
NSS Webmaster
www.caves.org
--- End Message ---
--- Begin Message ---
For all Texas cavers who won an award at the NSS please email me details off
line by Friday.
- Thanks!
Jill
--- End Message ---
--- Begin Message ---
There will be a Sunday Swim this Sunday (August 12th) 2:00 - 6:00 or so.
Still thinking about August 26th, but you better check. 512-897-9235 Pete
--- End Message ---
--- Begin Message ---
There is no official Kiwi Sink dig on August 26th. There is one August
19th, & one September 9th. (Check the calendar at utgrotto.org ). That means I
MIGHT have a Swim on the 26th without conflicting.
--- End Message ---
--- Begin Message ---
Reference conflict between Kiwi Sink Dig and Sunday Swims: For the
most part there is no significant conflict. The people who populate
the digs are mostly not the same ones who go to Sunday Swims. In fact,
the digs are usually over by 3 or so and anybody wanting to go
swimming could easily easily quit at 2 and make the drive to
Stricklandia and have several hours left to swim and cool off.
--Ediger
On Wed, Aug 8, 2012 at 10:25 PM, <pstrickla...@austin.rr.com> wrote:
> There is no official Kiwi Sink dig on August 26th. There is one August
> 19th, & one September 9th. (Check the calendar at utgrotto.org ). That means
> I MIGHT have a Swim on the 26th without conflicting.
>
> ---------------------------------------------------------------------
> Visit our website: http://texascavers.com
> To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com
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>
--- End Message ---
--- Begin Message ---
I think it is ridiculous to think Kiwi Sink is a conflict with Sunday Swin-
Just my 2 cents.
--- On Wed, 8/8/12, pstrickla...@austin.rr.com <pstrickla...@austin.rr.com>
wrote:
> From: pstrickla...@austin.rr.com <pstrickla...@austin.rr.com>
> Subject: [Texascavers] Kiwi Sink vs Sunday Swim
> To: texascavers@texascavers.com
> Date: Wednesday, August 8, 2012, 10:25 PM
> There is no official
> Kiwi Sink dig on August 26th. There is one August 19th,
> & one September 9th. (Check the calendar at utgrotto.org
> ). That means I MIGHT have a Swim on the 26th without
> conflicting.
>
> ---------------------------------------------------------------------
> Visit our website: http://texascavers.com
> To unsubscribe, e-mail: texascavers-unsubscr...@texascavers.com
> For additional commands, e-mail: texascavers-h...@texascavers.com
>
>
--- End Message ---
--- Begin Message ---
Kiwi Sink Dig--for those wondering. The next scheduled dig will be 19
August. Terry and I will both be in (different) foreign countries so
the loaded barrels will probably not get dumped. There are, however,
or will be 6 or 7 empty barrels to be filled and dumped later. Kris
and Will and Ernie have spent some time digging into voids and loose
fill material and seem to be very near breaking through into actual
cave passage heading north (in the direction of the suspected Northern
Borehole). Ernie Garza will be on hand to supervise pit operations.
His number is 512-847-0183 if you need information, directions, or
proof of his existence. --Ediger
--- End Message ---
--- Begin Message ---
I want to thank everyone who replied to my request for information
rechargeable batteries. I now have a lot of really good information on
the batteries and on the charger.
Now it is up to me to decide my course of action.
James Jasek
--- End Message ---
--- Begin Message ---
James,
Thanks for asking the question! Now I've decided to spring for the following:
Maha MH-C808M Eight Cell Combo NiMH/NiCD Battery Charger (from ZBattery.com)
IMEDION C Cell 5000mAh "Ready When You Are" Rechargeable Battery (two 2-Paks
from ZBattery.com)
PowerEx "Ready When You Are" AAA [NEW! 950mAh] NiMH Rechargeable Batteries - 4
Batteries Per Pack (from Amazon.com)
Since Sanyo Eneloops (which are Low Self Discharge (LSD) batteries) are not
available in the C-cell size, I'm opting for the PowerEx AAA Imedions, which is
the Maha brand of LSDs. Their new AAA rechargeables look to be a big
improvement over my current AAAs.
When I first purchased rechargeable batteries and a multi-battery charger in
2008, there weren't many options for batteries other than the AA size. It's
nice to see that I can upgrade and not have to worry about charging every dang
battery I own the night before a caving trip just to be on the safe side.
Diana
P.S. The old rechargeable batteries won't be thrown out, but will go on to live
a useful life as household batteries for clocks, remotes, handheld flashlights,
etc.
* * * * * * * * * * * * * * * * * * * * * * * * * * * *
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 9, 2012, at 11:17 AM, James Jasek wrote:
> I want to thank everyone who replied to my request for information
> rechargeable batteries. I now have a lot of really good information on the
> batteries and on the charger.
>
> Now it is up to me to decide my course of action.
>
> James Jasek
________________________________
UT Southwestern Medical Center
The future of medicine, today.
--- End Message ---
--- Begin Message ---
And another thanks from NM. I read all that stuff because a couple of
years ago I was tired of shuffling through the strobe batteries to
find enough that worked on my 2-3 strobes I had just carried into the
cave. I also found out that certain NM caves are frigid! At least two
are below freezing and the cold takes a toll on cameras, strobes,
slaves, etc. I had previously bought some Lenmar R2G AAs which were
working out fine. But since I also had just retired my 10 year old
homemade 24 LED light that ran on 3 C cells for a 277 Lumen Fenix
light that runs on 4 AAs, I needed a better charger than the old ones
that sometimes cooks the batteries.
I opted for the La Crosse BC1000 charger and also got a couple of sets
of Eneloops as well. Apparently the La Crosse is more accepting of
ancient batteries that may have a lower voltage, and I liked the
individual control/ monitoring features of this better technology
charger.
- Pete
On Aug 9, 2012, at 12:25 PM, Diana Tomchick wrote:
James,
Thanks for asking the question! Now I've decided to spring for the
following:
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--- Begin Message ---
I just noticed that I mistakenly stated that I was going to replace my old
C-cells with PowerEx AAA Imedions--what a goof! Can't do that, I need to
replace them with the Imedion C cells.
ZBattery.com had the best price for the cells and charger (better than Amazon),
but I had to pay shipping charges. I'm OK with that, sometimes it's a good
thing to support businesses other than Amazon.com, especially when the shipping
charges essentially wipes out the price difference.
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 9, 2012, at 1:25 PM, Diana Tomchick wrote:
> James,
>
> Thanks for asking the question! Now I've decided to spring for the following:
>
> Maha MH-C808M Eight Cell Combo NiMH/NiCD Battery Charger (from ZBattery.com)
> IMEDION C Cell 5000mAh "Ready When You Are" Rechargeable Battery (two 2-Paks
> from ZBattery.com)
> PowerEx "Ready When You Are" AAA [NEW! 950mAh] NiMH Rechargeable Batteries -
> 4 Batteries Per Pack (from Amazon.com)
>
> Since Sanyo Eneloops (which are Low Self Discharge (LSD) batteries) are not
> available in the C-cell size, I'm opting for the PowerEx AAA Imedions, which
> is the Maha brand of LSDs. Their new AAA rechargeables look to be a big
> improvement over my current AAAs.
>
> When I first purchased rechargeable batteries and a multi-battery charger in
> 2008, there weren't many options for batteries other than the AA size. It's
> nice to see that I can upgrade and not have to worry about charging every
> dang battery I own the night before a caving trip just to be on the safe side.
>
> Diana
>
> P.S. The old rechargeable batteries won't be thrown out, but will go on to
> live a useful life as household batteries for clocks, remotes, handheld
> flashlights, etc.
>
> * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> 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 9, 2012, at 11:17 AM, James Jasek wrote:
>
>> I want to thank everyone who replied to my request for information
>> rechargeable batteries. I now have a lot of really good information on the
>> batteries and on the charger.
>>
>> Now it is up to me to decide my course of action.
>>
>> James Jasek
>
>
> ________________________________
>
> UT Southwestern Medical Center
> The future of medicine, today.
>
> ---------------------------------------------------------------------
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--- Begin Message ---
On some level, this could be cave(r)-related....
http://water.epa.gov/drink/emerprep/emergencydisinfection.cfm?072112
- julia
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--- Begin Message ---
This is also useful info for cavers, concerning
hypothermia: <http://www.wemsi.org/cold.html>.
Mark
At 12:39 PM 8/9/2012, germa...@aol.com wrote:
On some level, this could be cave(r)-related....
http://water.epa.gov/drink/emerprep/emergencydisinfection.cfm?072112
- julia
Please reply to mmin...@caver.net
Permanent email address is mmin...@illinoisalumni.org
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--- Begin Message ---
Folks,
I have (had) a Canon EOS Rebel XT digital (8 mg) camera. The camera bag rolled
out of the car and fell on its head at convention and now the LCD screen
doesn't function (the one with all the camera data, not the screen which shows
the picture). Lens works fine. So, is this thing worth repairing considering
there is probably a repair cost to tell me how much more it will cost to repair
or should I buy a new camera. If so, I was thinking of just buying the same or
similar body. Seems they have upgraded it some and they now use SD cards which
would be nice. Any thoughts on what I should do. It has been a pretty good
camera up until now. I certainly don't need any of the high end professional
cameras but still like a SLR.
Geary
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