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diy solar

Testing impedance on 12v liFePO4

nicoloks

New Member
Joined
Jul 20, 2022
Messages
35
Hi All,

I recently bought a couple of basic Eco Worthy 12v 100Ah liFePO4 batteries which seem to checkout on a straightforward capacity test.

Just wondering what the best way is to test the internal resistance of these batteries where I can't get access to the cells directly? Is using a resistor (s) along with a multimeter and varying sizes loads the best way? Alternatively, should I be looking at a dedicated battery impedance tester like the YR1035+?

Also, does anyone know of any reference data I can use as a guide on what I should be expecting in terms of resistance and temperature in relationship to battery load?
 
Why do you want to test the internal resistance of these batteries?
 
Battery health mainly. I expect these will be B grade cells, so would be good to have a frame of reference on their health as I put them into service.
 
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