Originally Posted by GordonTarling
I just received two new 4S 2200mAh packs of a reputable brand from a UK supplier. On checking the IR of the cells, they're all pretty much the same at around 16mOhms. I checked an identical pack that's had some use and is over a year old and each cell is around 8mOhms. Can I expect the IR of the new packs to fall with use, or should I reject them now?
Wow, assuming temperature is about the same those cells are not very good. 16 mOhms is like an old, old pack. I had a similar problem with a local hobby shop where I wanted to buy one of their "house brand" lipos. I came in with the ESR meter and tested one pack and the cells were 20-21 mOhms. I tested more and all were in that range. These were simply relabeled new old stock lipos.