ICR vs INR vs IMR Lithium Battery Types

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Oct 8, 2016
I saw questions being asked on the Facebook group regarding the different chemistries. I learned a bit myself and thought it would be good to save the information here for reference.

Long-Form NameChemical AbbreviationName Format 1Name Format 2Name Format 3
Lithium Manganese OxideLiMn2O4IMRLMOLi-Manganese
Lithium Manganese NickelLiNiMnCoO2INRNMC---
Lithium Nickel Cobalt Aluminum OxideLiNiCoAlO2---NCALi-Aluminum
Lithium Nickel Cobalt OxideLiNiCoO2---NCO---
Lithium Cobalt OxideLiCoO2ICRLCOLi-Cobalt
Lithium Iron PhosphateLiFePO4IFRLFPLi-Phosphate
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Mar 14, 2021
Really cool info. Now my question is what does the different types mean for building packs? and how do you identify what type a particular cell is?


Active member
Sep 25, 2018
how do you identify what type a particular cell is?
If you take LiFePO4 out of the mix you really only have 2 main chemistry's. ICR and INR. In very simple rudimentary terms Cobalt and Nickel.
The hybrid versions are cobalt and a combination of other metals/oxides.
Cobalt and most hybrid are generally low drain i.e. laptop, medical packs, and any packs that don't require a heavy discharge. They also have an IR (Internal Resistance) of between 35mΩ to ~80mΩ being on the high end.
Nickel based cells are your high drain cells, power tool packs, floor sweepers and anything that requires lots of amps. Their IR is usually between 10mΩ to 25mΩ.
Search on my posts on how cells behave in parallel and this thread https://secondlifestorage.com/index.php?threads/high-and-low-drain-cells-mixed.7873/
I basicly I reccomend ICR and hybrid chemistry can be combined in a powerwall if the min max IR is between 15mΩ to 20mΩ at the highest.
I.e. My preferences is to keep cells between 40mΩ to 50mΩ. I would not include INR nickel based cells into a cobalt chemistry build.
The same goes with INR chemistry cells. Personally I would not mix and match.
Others may not so much disagree but claim there is no harm in mixing both chemistries. I think it makes a big difference in the long run on the health of the packs. To each their own.