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On Tue, 19 Sep 2017 07:20:39 -0700 (PDT), captainvideo462009@gmail.com
wrote:
I would like to test my 9V, C, D, AA, and AAA under the proper load. I don't know what that would be for each size though. I want to build a little test fixture for this with a meter and the appropriate load connected for each size. Can someone please tell me what the appropriate loads would be. Thanks, Lenny
Well, you could try bouncing the cells:
http://gizmodo.com/an-amazingly-simple-way-to-test-if-a-battery-is-dead-1138197569
https://lifehacker.com/test-if-your-batteries-are-dead-by-dropping-them-on-a-h-1630525062
I tried it and couldn't make it work, but maybe you'll have better
luck.
Lots of commercial alkaline battery testers available. I have one of
these:
http://www.ebay.com/itm/Amprobe-BAT200-Battery-Tester-/282415287281
There are quite a few do it thyself battery tester construction
articles. Pick whichever looks good:
https://www.google.com/search?q=build+alkaline+battery+tester
Note: I've on a campaign to purge from my life as many alkaline
batteries as possible. I'm tired of leaky batteries destroying my
equipment.
http://802.11junk.com/jeffl/crud/Kirkland-AAA-leak.jpg
Mostly, I'm switching to LiIon. Where that's not possible, LSD (low
self discharge) NiMH cells. If the device will not run on NiMH, it
gets recycled.
--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
I would like to test my 9V, C, D, AA, and AAA under the proper load.
captainvi...@gmail.com wrote:
I would like to test my 9V, C, D, AA, and AAA under the proper load.
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
On Tue, 19 Sep 2017 07:20:39 -0700 (PDT), captainvideo462009@gmail.com
wrote:
I would like to test my 9V, C, D, AA, and AAA under the proper load. I don't know what that would be for each size though. I want to build a little test fixture for this with a meter and the appropriate load connected for each size. Can someone please tell me what the appropriate loads would be.. Thanks, Lenny
For alkaline, I just measure the open circuit voltage...
that seems to be good enough for me. 1.6 fully charged,
1.4 OK, 1.2 or less pitch it.
George H.
Phil Allison <pallison49@gmail.com> wrote:
captainvi...@gmail.com wrote:
I would like to test my 9V, C, D, AA, and AAA under the proper load.
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
Greg
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
ESR.
Have you ever tried to measure the ESR of a battery with one ofGS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
ESR.
** Err - with an ESR meter, like this one:
http://bobparker.net.au/esr_meter/esrmeter.htm
..... Phil
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
ESR.
** Err - with an ESR meter, like this one:
http://bobparker.net.au/esr_meter/esrmeter.htm
Have you ever tried to measure the ESR of a battery with one of
these?
On Thursday, September 21, 2017 at 3:35:43 AM UTC-4, GS wrote:
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
IIRC, you take the open circuit voltage and write it down. You take a voltage reading under a known fixed load and write that down. You plug those two voltage readings along with the load resistance value into a formula (that I can't recall) and you get the internal resistance of the battery.
Waaaay too much trouble IMO. In recent years, I've found OC voltage sufficient to determine battery condition of basic alkaline cells. For high drain applications such as flash lights, anything at 1.5 is fine. For lower drain things like pocket radios or remote controls, anything above 1.3 works for many months. Any cell that reads 1.55 or above is virtually new.
On Thursday, September 21, 2017 at 7:46:39 AM UTC-4, John-Del wrote:
On Thursday, September 21, 2017 at 3:35:43 AM UTC-4, GS wrote:
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
IIRC, you take the open circuit voltage and write it down. You take a voltage reading under a known fixed load and write that down. You plug those two voltage readings along with the load resistance value into a formula (that I can't recall) and you get the internal resistance of the battery.
Waaaay too much trouble IMO. In recent years, I've found OC voltage sufficient to determine battery condition of basic alkaline cells. For high drain applications such as flash lights, anything at 1.5 is fine. For lower drain things like pocket radios or remote controls, anything above 1.3 works for many months. Any cell that reads 1.55 or above is virtually new.
Wow, too much trouble? It's just ohm's law.
Say V_O is open circuit voltage, V_L is with load R.
I = V_L/R
Bat_R = (V_O-V_L)/I
(The ESR may change with load current...
I don't know.)
George H.
On Thursday, September 21, 2017 at 7:46:39 AM UTC-4, John-Del wrote:
On Thursday, September 21, 2017 at 3:35:43 AM UTC-4, GS wrote:
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
IIRC, you take the open circuit voltage and write it down.
Waaaay too much trouble IMO. In recent years, I've found OC voltage sufficient to determine battery condition of basic alkaline cells. For high drain applications such as flash lights, anything at 1.5 is fine. For lower drain things like pocket radios or remote controls, anything above 1.3 works for many months. Any cell that reads 1.55 or above is virtually new.
Wow, too much trouble? It's just ohm's law.
Say V_O is open circuit voltage, V_L is with load R.
I = V_L/R
Bat_R = (V_O-V_L)/I
(The ESR may change with load current...
I don't know.)
George H.
On 9/22/2017 6:06 AM, ggherold@gmail.com wrote:
On Thursday, September 21, 2017 at 7:46:39 AM UTC-4, John-Del wrote:
On Thursday, September 21, 2017 at 3:35:43 AM UTC-4, GS wrote:
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
IIRC, you take the open circuit voltage and write it down.
You take a voltage reading under a known fixed load and write that down.
You plug those two voltage readings along with the load resistance
value into a formula (that I can't recall) and you get the internal
resistance of the battery.
Which voltage do you use?
When you apply the load, the voltage starts to drop.
So, which voltage along that curve do you use?
And when you "let go", the voltage won't return to the original level.
Note that the voltage at the instant you apply the load won't be available
unless you use a scope, or some otherwise accurate sampling to measure it..
Great in theory, but not nearly so simple in practice.
On Sunday, September 24, 2017 at 5:34:07 AM UTC-4, mike wrote:
On 9/22/2017 6:06 AM, ggherold@gmail.com wrote:
On Thursday, September 21, 2017 at 7:46:39 AM UTC-4, John-Del wrote:
On Thursday, September 21, 2017 at 3:35:43 AM UTC-4, GS wrote:
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition..
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells..
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
IIRC, you take the open circuit voltage and write it down.
You take a voltage reading under a known fixed load and write that down..
You plug those two voltage readings along with the load resistance
value into a formula (that I can't recall) and you get the internal
resistance of the battery.
Which voltage do you use?
When you apply the load, the voltage starts to drop.
So, which voltage along that curve do you use?
And when you "let go", the voltage won't return to the original level.
Note that the voltage at the instant you apply the load won't be available
unless you use a scope, or some otherwise accurate sampling to measure it.
Great in theory, but not nearly so simple in practice.
If you're applying a load suitable enough to cause a constant drift of voltage or the OC voltage doesn't return to pre test state, the load is too high for the battery in question or the battery is shot. Old School battery testers used to use a switch to select which resistor to load down the battery in question, AA, AAA, C, etc., while displaying the battery voltage on the meter. The only time I saw the meter drift downward was if selecting a D battery test for a AAA for instance.
Do the math.On Sunday, 24 September 2017 19:32:47 UTC+1, John-Del wrote:
On Sunday, September 24, 2017 at 5:34:07 AM UTC-4, mike wrote:
On 9/22/2017 6:06 AM, ggherold@gmail.com wrote:
On Thursday, September 21, 2017 at 7:46:39 AM UTC-4, John-Del wrote:
On Thursday, September 21, 2017 at 3:35:43 AM UTC-4, GS wrote:
Phil Allison <pallison49@gmail.com> wrote:
GS wrote:
--------------------
Phil Allison
** The ESR of a cell or battery is a good guide to its condition.
A fresh AA alkaline measures 0.1 ohms or lower while a tired one
measures 1 ohm or greater, a fresh 9V measures under 1 ohm. Along with a
voltage test you have enough info to match or discard used cells.
.... Phil
What's a good way to do that ?
** Do what ?
Test ESR or correlate it with open cct cell voltage?
.... Phil
ESR.
Greg
IIRC, you take the open circuit voltage and write it down.
You take a voltage reading under a known fixed load and write that down.
You plug those two voltage readings along with the load resistance
value into a formula (that I can't recall) and you get the internal
resistance of the battery.
Which voltage do you use?
When you apply the load, the voltage starts to drop.
So, which voltage along that curve do you use?
And when you "let go", the voltage won't return to the original level.
Note that the voltage at the instant you apply the load won't be available
unless you use a scope, or some otherwise accurate sampling to measure it.
Great in theory, but not nearly so simple in practice.
If you're applying a load suitable enough to cause a constant drift of voltage or the OC voltage doesn't return to pre test state, the load is too high for the battery in question or the battery is shot. Old School battery testers used to use a switch to select which resistor to load down the battery in question, AA, AAA, C, etc., while displaying the battery voltage on the meter. The only time I saw the meter drift downward was if selecting a D battery test for a AAA for instance.
If your battery voltage is drifting down, its ESR is drifting up. If you want to know what state it's in after the test you'd use the last voltage reading. But there's no point, if it's dropping noticeably either it's had its day or the test load is too high.
NT