testing internal resistance

[hwse]

Any tutorials on how to test internal resistance? What tools and / or meters are required?

 

[Samsonite801]

Did you happen to see this page?

BU-902: How to Measure Internal Resistance

BU meta description needed...

batteryuniversity.com

I've seen a lot of internal resistance testers before on Amazon:

Amazon.com : lithium internal resistance tester

I've never used one myself yet, and haven't really found the need yet to bother checking any of my cells, as mine all seem to work fine out of the box. I guess some may want to test their for learning or troubleshooting / optimization purposes, which is perfectly fine to do.

It seems like I thought Will Prowse had made some You Tube videos on testing internal resistance, I think I remember seeing some before.

Here's a random search on You Tube (that Off grid Garage guy knows a bunch of stuff):

https://www.youtube.com/results?search_query=will+prowse+internal+resistance+test

More background info:

Cell internal resistance (what does it mean)

Today one of my new orders from Alibaba arrived and i try to test my Internal Resistance Tester. Im a little bit confused because all Cells (120AH) were between 1,4-1,6 mohm. I thought it must be arround 0,2 mohm. Maybe someone can explain what the internal resistance mean and in which value it...

diysolarforum.com

 

[hwse]

Did you happen to see this page?

BU-902: How to Measure Internal Resistance

BU meta description needed...

batteryuniversity.com

I've seen a lot of internal resistance testers before on Amazon:

Amazon.com : lithium internal resistance tester

I've never used one myself yet, and haven't really found the need yet to bother checking any of my cells, as mine all seem to work fine out of the box. I guess some may want to test their for learning or troubleshooting / optimization purposes, which is perfectly fine to do.

It seems like I thought Will Prowse had made some You Tube videos on testing internal resistance, I think I remember seeing some before.

Here's a random search on You Tube (that Off grid Garage guy knows a bunch of stuff):

https://www.youtube.com/results?search_query=will+prowse+internal+resistance+test

More background info:

Cell internal resistance (what does it mean)

Today one of my new orders from Alibaba arrived and i try to test my Internal Resistance Tester. Im a little bit confused because all Cells (120AH) were between 1,4-1,6 mohm. I thought it must be arround 0,2 mohm. Maybe someone can explain what the internal resistance mean and in which value it...

diysolarforum.com

I had seen that $26 tester and it is partly what prompted my question. I posted a question on Amazon about the minimum milliOhm reading and someone said 1.0 milliohm on the 3.2v LFP setting. That is fine for small cylindrical cells but as the capacity goes up, the IR goes down so on our 289A cells, it is down around 0.18-mOhm so it would not be able to read it.
Andy at Off Grid Garage uses one that will read down to 0.01mOhms which would be fantastic but it is only available on AliExpress and it would take several months to get to me.

I did some more searching and found this unit that looks to have 0.01mOhm resolution that should do the 280A cells.

 

[Samsonite801]

I had seen that $26 tester and it is partly what prompted my question. I posted a question on Amazon about the minimum milliOhm reading and someone said 1.0 milliohm on the 3.2v LFP setting. That is fine for small cylindrical cells but as the capacity goes up, the IR goes down so on our 289A cells, it is down around 0.18-mOhm so it would not be able to read it.
Andy at Off Grid Garage uses one that will read down to 0.01mOhms which would be fantastic but it is only available on AliExpress and it would take several months to get to me.

I did some more searching and found this unit that looks to have 0.01mOhm resolution that should do the 280A cells.

Yeah, you could check the return policy and if it proves not to work out for you, you could return it.