2s Lipo Internal Resistance

Joshnewb

Well-Known Member
Messages
192
Hey guys,
Still learning lipo batteries...
Got one (2s 5000mah) last spring, used it all summer and fall, so much better than nimh in the ruckus
after metal drive shafts lol

didn't use it all winter, took it out today and measured volts
cell one 3.85 cell two 3.86 pretty good i thought for just sitting all winter

but cell one resistance measured 22 and cell two was 2
should i be worried? the pack? will they balance out
all these readings came from imax b6ac v2
 
As long as the battery runs fine, doesn’t puff and the cells stay relatively balanced during runs, it’s probably just a wonky connection between the battery and the charger.
 
I'd just keep an eye on the cell. If that one cell is the first to reach 4.2v, and is always the lowest voltage cell after a run, then I keep a closer watch on it. I don't remember exact IR readings of the packs that I got rid of, but I do know they were around 26 mΩ. I usually take a pack out of commision when I can't take the long charging times when balancing the cells.
 
It should be fine on 2wd. In larger 4x4 systems the ir will cause problems. We just had a pack with higher ir start melting the solder at the esc. Switched to a different pack and it was fine. I ran the same pack on my 2wd with no problems. Gonna mark that pack to just use in our crawlers now.
 

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