Parallel Internal Resistance Measuring?

[rg12]

If I have 10 brand new cells in parallel that each has 12mOh IR, will measuring the whole group paralleled show 1.2mOh or the calculation isn't so linear and simple?

 

[larsb]

it will

 

[DogDipstick]

If I have 10 brand new cells in parallel that each has 12mOh IR, will measuring the whole group paralleled show 1.2mOh or the calculation isn't so linear and simple?

Why dont you measure it? See from empirical evidence.

Usual not a ( tiny ) 18650 has exact same resistance ( one is 12.5mOh, one is 13, one might be 10mOh.. one might be 17mOh.. ) as the one next to it, but close enough. However, depending on the resolution of measurement... Just parallel them and test the resistance. Compare to the reading from the basline you took. Shouldnt take more than an hour or two to cycle the cell /pack. There you have your readings. Then you know empirically.

Or you could just assume your math is right, but year that is the way it workds when paralleling.

 

[amberwolf]

and just to save the next thread from being posted, after you parallel the cells, and then put them in series with other paralleled cells, you then add all the group resistances together.

so if you have a 14s pack, with 10p groups each at 1.2mohm, then that's 14 times 1.2mohm for 16.8mohm total pack resistance.

 

[rg12]

Thanks, will test and report