Lithium battery AC vs DC measure method

Thread Starter

killerpiraat

Joined Feb 17, 2020
11
Hi,

Because there is a square wave test you can do if you can monitor with a scope.
I'll see if i can find the pdf or you can search yourself.

If this problem is subtle you may have to resort to testing and logging, then shipping, then noting which ones came back and which ones didnt, then compare waveforms so in the future you can start to predict which cones would come back and simply dont use those. As time goes on you should be able to narrow it down to which cones will fail. This is like a last resort.
I think you mean this one.

https://www.litiumbatteri.no/pdffiler/ComparingMethods2.pdf

haha, wel thats a way to narrow it down indeed. Great input!
 

MrAl

Joined Jun 17, 2014
7,189
I think you mean this one.

https://www.litiumbatteri.no/pdffiler/ComparingMethods2.pdf

haha, wel thats a way to narrow it down indeed. Great input!
Hi,

Ok that's not it but that is interesting too so that adds to the pot so to speak.

I was lucky i found it again:
https://www.sciencedirect.com/science/article/pii/S187661021732430X

As i was saying before though you may have to collect some statistical data before you can make really good decisions about go/no-go status for a given battery type.

I have been doing this so long with AA alkalines that i can look through a cheap telescope at a battery 10 miles distant and estimate the remaining charge (ha ha).:)
But seriously start measuring the open circuit voltages of each battery with a good digital meter and logging the measurements and see if you can find a correlation to those that fail too soon and those that last. It may be that they are selling old batteries and the open circuit voltage often reflects that. Keep in mind the difference could be 0.05 volts so you need a decent meter and use the sme meter for all the readings if you can.
 
Last edited:

KeithWalker

Joined Jul 10, 2017
682
But why would i do this? This is information that is given by the manufacturer in the datasheet of the battery right? I mean, i assume that you want to test how long the battery can last under certain loads? ie, the capacity test? So whats the point of this test? Testing if the specs of the battery are the same as the manufacturer says? The battery is 230 mAh with a load of 5k6. Thats 430 Hours before the battery is drained. Seems to me like a long test
Some of the batteries you are buying are not meeting the Manufacturer's specification. You need some quality control. The usual way of doing that is by testing a sample of every new batch. The point of doing a capacity test is to see whether the batteries that fail have any common characteristics that show up in other quicker tests made on them. It's up to you to decide which tests is worth the time and expense..
 
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