battery health of LP_ 4/4N/14

[phot]

Hello all
I want to sell two of my 1dx bodies. I have 4 batteries, and obviously do not want to give away the best batteries. 
Is there a way to find out the battery HEALTH??
I know how to calibrate and check charge status, however I could not find anything that would tell me about the battery health. 
Any help would be greatly appreciated

always good light 

[shadowsports]

Greetings,

I would think an ohms meter could be used to help identify the better 2 of the 4.  You'll have to check them over a few days to get an average.

My R5 C has a little meter (in the battery menu) that tells me the general health of a battery.  Its different than the actual power remaining.  I don't know if this is included on the 1Dx series.  I'm sure one of our 1Dx Series owners will reply here 😃