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Model Forum / Radio Controlled / Air Models / May 2007



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OT(sorta) rechargable Lith CR123

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MJKolodziej - 27 May 2007 15:52 GMT
http://www.amazon.com/Lithium-Rechargeable-batteries-package-charger/dp/B000LTYZ
RY/ref=sr_1_1/103-2739774-9937428?ie=UTF8&s=electronics&qid=1180276501&sr=8-1


My brother asked if I thought these were worth it.  My final answer was that
whatever he used them in(small flashlights ei: Surefire) didn't have low cut
off protection and would ruin quickly.
Anyone have any experience with these?  Or lacking that, our usual well
informed conjecture.
:)
TIA,
mk
ps does anyone know how tinyurl works?
Martin X. Moleski, SJ - 27 May 2007 16:49 GMT
>http://www.amazon.com/Lithium-Rechargeable-batteries-package-charger/dp/B000LTYZ
RY/ref=sr_1_1/103-2739774-9937428?ie=UTF8&s=electronics&qid=1180276501&sr=8-1

>My brother asked if I thought these were worth it.  My final answer was that
>whatever he used them in(small flashlights ei: Surefire) didn't have low cut
>off protection and would ruin quickly.
>Anyone have any experience with these?  Or lacking that, our usual well
>informed conjecture.
>:)

I'm going to pass on that question.  I know my limits!  ;o)

And there ARE some rocket scientists in this group.  It's
amazing how much technical information comes through here
from time to time.

>ps does anyone know how tinyurl works?

Go to http://tinyurl.com

Insert the long link in the text field.

Press the Make Tinyurl! button next to the text field.

Mark and copy the resulting tinyurl.

Paste it into where you want it.

In this case, it's:

http://tinyurl.com/2nwzda

            Marty
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Red Scholefield - 27 May 2007 18:42 GMT
If you use them in applications where regular alkaline AA cells are used,
the voltage will be too high and could destroy the unit.  You are right on
the low voltage cut off problem as well.  You can buy a lot of Alkaline AA
cells for $19.95.
Signature

Red S.
Red's R/C Battery Clinic
http://www.rcbatteryclinic.com
Check us out for "revolting" information.

> http://www.amazon.com/Lithium-Rechargeable-batteries-package-charger/dp/B000LTYZ
RY/ref=sr_1_1/103-2739774-9937428?ie=UTF8&s=electronics&qid=1180276501&sr=8-1

>
[quoted text clipped - 7 lines]
> mk
> ps does anyone know how tinyurl works?
Morgans - 27 May 2007 19:49 GMT
> If you use them in applications where regular alkaline AA cells are used,
> the voltage will be too high and could destroy the unit.  You are right on
> the low voltage cut off problem as well.  You can buy a lot of Alkaline AA
> cells for $19.95.

It would seem like it would be smart to include a slug (for lack of a better
term) so that a two cell alkaline device would use one cr123 battery and a
slug, to pass the current through it, and that would get the voltage in the
ball park.

It would also not be that big of a deal to offer a slug with a low voltage
cut-off, and at the same time, a voltage regulator, since one IC chip could
likely do both.

Why don't you market that, Red, and make a fortune!
Signature

Jim in NC

Red Scholefield - 28 May 2007 01:01 GMT
What, and ruin my lifestyle. I would have to move to the country club and
take up golf. No thanks. For the slug, just take a piece of 1/2 inch wood
dowel the length of a AA cell and wrap aluminum foil such that both ends are
covered and you are in business..   (Patent pending) .
Signature

Red S.
Red's R/C Battery Clinic
http://www.rcbatteryclinic.com
Check us out for "revolting" information.

> It would also not be that big of a deal to offer a slug with a low voltage
> cut-off, and at the same time, a voltage regulator, since one IC chip
> could likely do both.
>
> Why don't you market that, Red, and make a fortune!
Morgans - 28 May 2007 06:33 GMT
> What, and ruin my lifestyle. I would have to move to the country club and
> take up golf. No thanks. For the slug, just take a piece of 1/2 inch wood
> dowel the length of a AA cell and wrap aluminum foil such that both ends
> are covered and you are in business..   (Patent pending) .

Man, that must be some really special aluminum foil, considering it has a
low voltage cut-off and voltage regulator built right into it!

How does it work for baking potatoes, though? <g>

I did something similar for making an adapter for charging my glow igniter
battery.  I cut a piece of dowel rod the length of an AA battery, (minus a
little) and fastened a wire on one end with a wood screw and a ring terminal
for the positive, and on the other end used a wood screw, ring terminal and
small fender washer for the negative, and ran the wires to an earphone jack
with a wheel collar on it, so that my igniter prongs would hook onto it.

I now can lay a quick charge onto it with one of those cheap auto shut-off
commercial AA or AAA size battery chargers with 4 slots controlled
individually.  Now I know when the thing is charged without overcharging it,
(like a wall wart is liable to do) and get much better battery life.

I also rolled cardboard around some NiMH AA batteries to make them as large
in diameter as a C sized battery.  The length was close enough to work OK.

 I did that because a few years back, the C batteries were not in the
stores much, and I had a small TV that I wanted to make recharge capable.

I also made a holder to charge individual AA sized NiMH batteries for my
radios and cameras and what-not, using my peak sensing fast field charger.

A piece of 1/2" CPVC water pipe will nicely fit AA batteries inside it.  I
cut a length that would work out to put 4 batteries end to end in it, with a
maglight end (with the coil spring) on one end, and a small (about a 10-32)
screw all of the way through the pipe to contact the positive battery end.
Connect it to the charger with alligator clips or ring terminals, and plug
the rig into the field charger, and away it goes.  A little longer tube will
work for 5 cells, or 8 cells ( plugged into the transmitter port) or more,
if you have a charger that will charge a larger variety of cell counts.

I hope some of these ideas will be useful for someone.  Feel free to pass
them on, if there are any new ideas you want to spread about.
Signature

Jim in NC

Ed Forsythe - 29 May 2007 13:21 GMT
Hi Jim,
Innovative and cheap Jim but I'' the lazy type. I opted for a dummy glow
plug charger adapter from Dave at Radical RC and a battery holder from Radio
Shack (also cheap) ;-)

>> What, and ruin my lifestyle. I would have to move to the country club and
>> take up golf. No thanks. For the slug, just take a piece of 1/2 inch wood
[quoted text clipped - 41 lines]
> I hope some of these ideas will be useful for someone.  Feel free to pass
> them on, if there are any new ideas you want to spread about.
 
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