Ah batery capacity logger

[Mosaic]

Regarding using the loaded delta V over a few seconds used to predict the Ah capacity of the lead acid battery; I have found that aged batteries exhibit a voltage bounce during the first 10 minutes of loading. The voltage drops and then recovers and then reasonably linearly drops until the voltage knee.

That makes the 'short' load test suspect for such batteries. My theory is that as the battery warms during the early part of the load test, the electrolyte's conductance increases, reducing the losses due to internal resistance and improving the battery's efficiency.

This effect is arguably more pronounced in older batteries with higher internal resistance.

 

[MrAl]

Wonders of marketing. You bought it. Others may too.

Other guys may have a tester that actually may be able to test batteries, but who in the right mind would buy their product if you can buy much better tester which tests 6 cells through a single connection and costs 30% less?

Which company do you think will stay in business longer? You guessed it. The next one, which will test batteries without any connections at all!

Hello again,

Well i happen to offer a battery tester myself to customers around the globe. As soon as their check clears i do a quick battery test telekinetically and then send them the results telepathically.
<<insert big chuckle right about here>> ha ha

Seriously, if that tester can check individual cells by just using connections to the two terminals i'd want to know the make and model of that unit so i can look up the spec's and check it out myself, i may be interested in purchasing one as i have had battery problems in the not too distant past too and would like a good tester to help. I already have a 100 amp load tester which isnt too bad, made with a load bank and analog meter, tells the Cold Cranking Amps.
Seriously i'd like to know the make and model of any tester that works well for checking the ampere hours especially if it does all the cells individually somehow. I could at least then have a chance to evaluate it myself. Thanks in advance.

 

[Mosaic]

I know of this one, but I have not tried it yet.
https://www.cadex.com/en/applications/automotive

BTW, I do have a concept that tests a battery by non contact induction. No connection required for the SoC test. Basically a colpitts oscillator metal detector that detects the lead content in the plates.

 

[alec_t]

Basically a colpitts oscillator metal detector that detects the lead content in the plates.

Wasn't that discussed in another thread? Nice concept, but there are practical difficulties in that results will depend greatly on battery geometry and detector placement.

 

[MrAl]

I know of this one, but I have not tried it yet.
https://www.cadex.com/en/applications/automotive

BTW, I do have a concept that tests a battery by non contact induction. No connection required for the SoC test. Basically a colpitts oscillator metal detector that detects the lead content in the plates.

Hi,

How does it deduce the SOC by measuring the lead content in the plates? Isnt the SOC related to the specific gravity of the electrolyte solution?

 

[Mosaic]

The sulphate anion bonds to the lead cation to create lead sulphate on the plates during discharge. Therefore less metal = less charge. The converse happens upon recharge. Thus by determining whether the sulphate anion is combined with the lead or not infers the SoC. This would require profiling a battery before it can be relied upon for accuracy. The usefulness includes determining whether plates are shedding or developing hard sulphate etc.