Battery Load Test?? ON TOPIC!!! :-)

On Wed, 13 Apr 2022 18:41:37 -0400, ABLE1 snipped-for-privacy@nowhere.net wrote as underneath :

Just measure the V with the battery in place (drain will be uA in this case) and that tells you the state of charge for Li-ion. 10% steps!

4.20 100% 4.06 3.98 3.92 3.87 3.82 3.79 3.77 3.74 3.68 3.45 3.00 0% or might be lower depending on the equipment! C+

On Thu, 14 Apr 2022 07:13:55 +0100, Charlie+ snipped-for-privacy@xxx.net wrote as underneath :

snip

Sorry about the top post in error! C+

On Thu, 14 Apr 2022 07:21:59 +0100, Charlie+ snipped-for-privacy@xxx.net wrote as underneath :

And the 3.45V is 5% ! C+

Much depends on specific the battery chemistry. More than you need to know in the article attached.

Peter Wieck Melrose Park, PA

The ones we used were made in Israel.. We just changed them all out when one got weak, and they were *very* predictable. Since the sensors are monitored and report in to the control even when not activated, they are always under a slight draw in the sensor even when not actually transmitting. The ones that are on pass doors of course fail first. When we got a battery error from central station for a sensor, we would replace all the sensor batteries at one shot for customers with a maintenance agreement. These batteries also had a somewhat short shelf life. Any batteries we had in stock more than 3 years were discarded. Honestly, just buy a set of new batteries and change them all out when the first one fails.

AMEN!

Peter Wieck Melrose Park, PA

ABLE1 =========

** Same as a Li button cell, but bigger.

You need an ESR meter ( ie the Bob Parker one) to test these - as the cell discharges or ages the reading increases by many times.

** Errr .... SAFT is a French company.

...... Phil

Ok, to all that have responded. Thanks!! However, I am trying to avoid buying another testing meter just to check a few batteries. I was thinking that if I could just add a small load I could see the difference between a NEW and USED battery just to get a ratio or just a hint!!

Now, I can just go with a 10k resistor and see what happens but maybe that is too much or not enough. Which is why I decided to ask.

Again thanks for all the comments!! And ON TOPIC as well!! :-)

So, SAFT is a French company but they are not "made" in France??

Les

ABLE1 ======

** Having suitable test gear is not optional.

** So now you tell us you have a new one ? ** Try a 100ohm resistor - if you have one.

Asking us how to do tricky testing with the WRONG meter is pain dumb.

..... Phil

It's a 3.6V lithium battery; typical drain (if it's lasting years) is 35 microamperes, and you can put a few hundred microamperes of load on it, so... use a voltmeter with a 10k ohm resistor in parallel, that'll suck about 300 uA.

Try it on some just-died batteries to see what is 'no good' level, and... take notes, it could be a year from now when you need to check 'em again. Expect 3.0V when dead.

One generation of Mac computers used such a battery: the clocks died at almost exactly 3 years. When I put a meter on the current draw, it measured exactly the load that (according to manufacturer ratings) would drain 'em at three years. I mean, about 1% accuracy. I did NOT expect that.

Gee Whiz Phil!! But I did!!

"I have a number of batteries that I would like to put apply small load to check the voltage. Hopefully it will give me an idea of the capacity that would be in the battery versus a new battery."

I guess you missed that?? Not a bid deal............ I guess!!

This dumb guy is just trying a small dumb experiment!! Hopefully my world will not come to an end as a result, although that is hard to predict!! Actually I have less days than I have already used!! :-)

Have a good Holiday!!!

Thanks,

Les

Hi whit3rd,

Great, that is doable!! Thanks for the hint for a start!! I just happen to have a 10K Ohm resistor in my box.

Will try over the weekend and see how it goes.

Thanks!!

Les

ABLE1 is Stupid LIAR ==================

** Having suitable test gear is not optional. ================================= ** Nope - you did NOT.

" Hopefully it will give me an idea of the capacity that would be in the battery versus a new battery. "

The above does not say that *at all*. See my ? It was a question.

** When you don't need help or advice. Don't ask here for it. Fuckwit.

..... Phil

Well I came here to ask an On Topic question and I get all of that??

SORRY!!! It seems that some here are ..........................

Never mind, I got the small hint I was looking for.

Einstein, Bell, Newton, Franklin, and many others were 100% successful on their very first experiment every time!! Yup!! That is what the history books say!!! Yea Right?!?! Not!!! ;-)

I Hope ALL have a good holiday feast!!

Les

ABLE1 is Stupid LIAR ================== >>>

** That was never an On Topic question.

Just like with so many dumb trolls, YOU wanted US to tell YOU how to make YOUR crackpot idea work.

** And one big hint from me you were not.

Piss off.

...... Phil

Trust the Drongo from down-under to come in late with badly explained (but possibly accurate) suggestions, go vulgar when questioned, and have the last words (also vulgar).

Not sure if they have Twinkies in Australia (or if it can afford them), but Drongo clearly lives on the functional equivalent.

Peter Wieck Melrose Park, PA

Peter,

Thanks for the taste bud tingle. I will now go to the closet in the basement and get a couple Twinkies for some desert!!

I doubt that they would be as good or very fresh if shipped all the way to Australia as they are in Pennsylvania. :-)

The rest is understood!!

Thanks,

Les