New way to quickly evaluates self-discharge of li-ion cells

I have found that, a published very surprisingly simple way to do that!
https://chargedevs.com/newswire/how-to-quickly-measure-and-evaluate-self-discharge-of-li-ion-cells




Doc

That's a great idea. If it is fast and accurate, perhaps it would be useful for weeding out bad cells before building a pack.

Cool! Could probably build one from an arduino or similar if I had time with logging and timing... but is one commercially available?

So many cool things I could do if I had the time.

Actually, I already own a USB counting ammeter. It won't stop after a certain time, but it records the time that it has been measuring current. It's good for 3v to 20v, so should be good for at least LiFePo4 and LiPo.

This could be done very easily.

Could you use this
http://www.ebikes.ca/news/battery-grinspector/
as a basis to do this testing? Using the throttle-in to read the cell voltage and the throttle out to match it? (thru a buffer chip, perhaps, to ensure no damage to the CA in the case of a cell issue)

Read the current by the shunt in line with the throttle-out ground?

Hi DoctorBass,

Thank you for the information.... the link to obtain the documentation has disappeared
so here is the pdf document for you all...
View attachment 5992-2517EN.pdf