[zapyourrideguy]

Bought CALB ca's about 5 yrs ago and had some 4 out of 45 cells come up with high resistance out of spec and replaced by CALB on warranty. I have now 4 more with resistance higher than 1.2 milliohms (spec is .7 or lower) with one of those 4 at 2.2 milliohms. These are all figures reported by Orion BMS.
Anybody have any insight into why this happens and what a recommended course of action to take? buy 4 new cells? look for used cells? It seems that especially the highest resistance cell is cutting into usable range. I still have resting charge of above 3.2 on my best cell when BMS is cutting back 1238 controller output.

I guess this is a good question because I think I have asked it 3 times with very little response.
Thanks in advance

 

[zapyourrideguy]

Thanks for the reply. They have been in pretty much continuous use since I installed them.
They may have sat a few times for several months here and there over the 4 years. but I have 25k+ miles on them and generally use the car as my daily driver. The Orion is set to balance charge at 3.55 I believe.

 

[zapyourrideguy]

yes cleaned connections and checked that Orion voltage reading matches my fluke meter reading at the cell. Just to make sure I will swap cells to make sure bad cell moves.
These were all installed polished terminals with light coat of noalox using tinned braided interconnects, and torqued to the specified 14 ft lbs
(20 nm)