Battery pack resistance.

[rizky_p]

I just bought a Tahmazo T30 charger then i measured 3 different battery pack few days ago here are the results:

1. 13 Elite AA: 280mOhm
2. 6 Sanyo 2700: 300mOhm
3. 10 Sanyo 2700: 1200mOhm(???)

i dont remember the exact figure, i just pull this from my head.

Elite batteries are really nice
But there is something wrong with my 10 Sanyo 2700 Pack right? They are the one with a short-circuited accident.

Thanks.

 

[VidPro]

if i remember the logic, the high self discharge, goes hand in hand with the high "resistance" . higher capacity stuff often is not as well "connected" to its electrolytes, or something like that
they have to give up something to wedge all the capacity in, unless they completly change the chemistry.
so your rock solid low capacity things will always have lower resistance, and they will always work better for Abusive discharge rates.

of coure Silver the battery master, will have more correct technicaly accurate info and actually know the resistances , i do it by feel.

also how rescentally cycled it is, how well the stuff went back into place during the charge , or how Vibrant, it is , will change in resistance.
so i would tell you to cycle it twice and read it.
BUT
its in series, and in series cycling it will likly cause reverse discharge so you would have to dissasemble to cycle it "correctally" and i am guessing its not Easy to disasemble, or you would tell us that SOME of the cells are higher resistance than others.

and yes, it looks BAD, but i doubt it is a total loss, which (again) would require disasembly , and cycling and testing. probably 2 bad cells, as opposed to the whole thing being bad.

 

[mdocod]

~120mOhm each sounds *possible* for worn out high cap NIMH cells.

 

[rizky_p]

yeah i will dissasemble the 10 Sanyo 2700 Pack and test them individually. doesnt seems right. It behaves like 9 cells instead like a 10 cells and drop under 10v under 1A loads.

battery testing are fun

Thanks.