hr(bob) hofmann@att.net
Guest
Fri Mar 05, 2010 1:42 am
I have a small battery-operated calculator that I rarely use, but when
I do need it, I want to be sure the battery hasn't run down. The
button cell can be a LR54, LR1130, D189, RW89, 389, SR54, or one of
several other codes, Either silver or alkaline. Does anyone know
which type of battery has the lowest internal self-discharge?
David Nebenzahl
Guest
Fri Mar 05, 2010 1:42 am
On 3/4/2010 4:01 PM Robert Macy spake thus:
Quote:
On Mar 4, 3:42 pm, "hr(bob) hofm...@att.net" <hrhofm...@att.net
wrote:
I have a small battery-operated calculator that I rarely use, but when
I do need it, I want to be sure the battery hasn't run down. The
button cell can be a LR54, LR1130, D189, RW89, 389, SR54, or one of
several other codes, Either silver or alkaline. Does anyone know
which type of battery has the lowest internal self-discharge?
Keep in mind, that a lot of battery chemistries have the following
quirk:
shelf life years!, unless...
measure the battery's voltage under load [in other words, use it once]
and a process starts that runs the battery down very quickly with
shelf life into even the 3 month range. [which means it's not good to
test the batteries in those emergency kits]
Anyone have numbers for this effect?
The Heisenberg uncertainty principle? Schrödinger's cat?
--
You were wrong, and I'm man enough to admit it.
- a Usenet "apology"
Robert Macy
Guest
Fri Mar 05, 2010 2:01 am
On Mar 4, 3:42 pm, "hr(bob) hofm...@att.net" <hrhofm...@att.net>
wrote:
Quote:
I have a small battery-operated calculator that I rarely use, but when
I do need it, I want to be sure the battery hasn't run down. The
button cell can be a LR54, LR1130, D189, RW89, 389, SR54, or one of
several other codes, Either silver or alkaline. Does anyone know
which type of battery has the lowest internal self-discharge?
Keep in mind, that a lot of battery chemistries have the following
quirk:
shelf life years!, unless...
measure the battery's voltage under load [in other words, use it once]
and a process starts that runs the battery down very quickly with
shelf life into even the 3 month range. [which means it's not good to
test the batteries in those emergency kits]
Anyone have numbers for this effect?
William Sommerwerck
Guest
Fri Mar 05, 2010 2:29 am
I don't "know", but I suspect the silver cells have a longer shelf life.
They also have a higher energy density.
hr(bob) hofmann@att.net
Guest
Fri Mar 05, 2010 3:30 am
On Mar 4, 7:29 pm, "William Sommerwerck" <grizzledgee...@comcast.net>
wrote:
Quote:
I don't "know", but I suspect the silver cells have a longer shelf life.
They also have a higher energy density.
That's also what I found in going to Wikipedia, so I'll look for the
silver cells at my local Menards Hardware store. It's enuf closer to
where I live than HD or Lowes to make it my store of choice, as long
as I get a name brand. For unnamed stuff, I am dubious about the
quality Menards sells ever since I bought some unnamed boxed finishing
nails and found them to be about as durable as uncooked spaghetti.
mm
Guest
Sat Mar 06, 2010 8:35 pm
On Thu, 4 Mar 2010 15:42:28 -0800 (PST), "hr(bob) hofmann_at_att.net"
<hrhofmann_at_att.net> wrote:
Quote:
I have a small battery-operated calculator that I rarely use, but when
I do need it, I want to be sure the battery hasn't run down. The
button cell can be a LR54, LR1130, D189, RW89, 389, SR54, or one of
several other codes, Either silver or alkaline. Does anyone know
which type of battery has the lowest internal self-discharge?
I often sort of hate it when people undermine an OP by suggesting
something entirely different from what he wants, so please forgive me
for doing just that.
How about a solar-powered calculator? I have a cheap one that does so
many functions I'll never use a bunch of them that runs off the
ceiling light, or the desk lamp. It may have been 20 dollars, years
ago, when there was a sale at Radio Shack. But no batteries. Here it
is, Radio Shack 10-digit Scientific Calculator EC-4032. It has logs
and trig and exponenets and I got it because it has hex, bin, and oct
arithmetic which I once in a while used as a programmer. Probably
something similar with a different model number now.
hr(bob) hofmann@att.net
Guest
Sun Mar 07, 2010 4:45 am
On Mar 6, 1:35 pm, mm <NOPSAMmm2...@bigfoot.com> wrote:
Quote:
On Thu, 4 Mar 2010 15:42:28 -0800 (PST), "hr(bob) hofm...@att.net"
hrhofm...@att.net> wrote:
I have a small battery-operated calculator that I rarely use, but when
I do need it, I want to be sure the battery hasn't run down. The
button cell can be a LR54, LR1130, D189, RW89, 389, SR54, or one of
several other codes, Either silver or alkaline. Does anyone know
which type of battery has the lowest internal self-discharge?
I often sort of hate it when people undermine an OP by suggesting
something entirely different from what he wants, so please forgive me
for doing just that.
How about a solar-powered calculator? I have a cheap one that does so
many functions I'll never use a bunch of them that runs off the
ceiling light, or the desk lamp. It may have been 20 dollars, years
ago, when there was a sale at Radio Shack. But no batteries. Here it
is, Radio Shack 10-digit Scientific Calculator EC-4032. It has logs
and trig and exponenets and I got it because it has hex, bin, and oct
arithmetic which I once in a while used as a programmer. Probably
something similar with a different model number now.
Thanx, it turns out that the ribbon connector from the calculator PWB
to the LCD display also came off when I opened it to take the
batteries out, and I ended up throwing eerything into the trash, I
probably don't need anything more than sine, cosine and tanget and
exponents so another calculator I have can handle those.
